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Home / DTC / P1190 — Pre-Catalyst Fuel Trim System Bank 1

P1190 — Pre-Catalyst Fuel Trim System Bank 1

Detailed page for trouble code P1190.

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P1190

BMW P — Powertrain

Pre-Catalyst Fuel Trim System Bank 1

Brand: BMW
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
Repair manuals

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Code

P1190

BUICK P — Powertrain

Engine Vacuum Leak

Brand: BUICK
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P1190

CADILLAC P — Powertrain

Engine Vacuum Leak

Brand: CADILLAC
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
85

Browse 85 CADILLAC manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

CADILLAC

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Code

P1190

CHEVROLET P — Powertrain

Engine Vacuum Leak

Brand: CHEVROLET
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
456

Browse 456 CHEVROLET manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

CHEVROLET

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P1190

CHRYSLER P — Powertrain

Engine Vacuum Leak

Brand: CHRYSLER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1190

DAEWOO P — Powertrain

THROTTLE ACTUATOR CRCT FAULT

Brand: DAEWOO
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
Repair manuals

Manual library for DAEWOO

75

Browse 75 DAEWOO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

DAEWOO

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1190

FORD P — Powertrain

Calibration Resistor Out Of Range

Brand: FORD
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
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Code

P1190

GM P — Powertrain

Engine Vacuum Leak

Brand: GM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
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Code

P1190

GMC P — Powertrain

Engine Vacuum Leak

Brand: GMC
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
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Code

P1190

HUMMER P — Powertrain

Engine Vacuum Leak

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

P1190

JAGUAR P — Powertrain

O2 Sensor Heater Circuit Low Resistance Fault 2

Brand: JAGUAR
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1190

LAND ROVER P — Powertrain

Low resistance failure in the oxygen sensor heater circuit heated 2 (banks 1 and 2 of sensor 1)

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

P1190

LINCOLN P — Powertrain

Calibration Resistor Out Of Range

Brand: LINCOLN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
166

Browse 166 LINCOLN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LINCOLN

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Code

P1190

MAZDA P — Powertrain

Calibration Resistor Out Of Range

Brand: MAZDA
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
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Code

P1190

MERCURY P — Powertrain

Calibration Resistor Out Of Range

Brand: MERCURY
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
296

Browse 296 MERCURY manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCURY

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Code

P1190

MITSUBISHI P — Powertrain

Fuel pressure sensor 2

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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Code

P1190

OLDSMOBILE P — Powertrain

Engine Vacuum Leak

Brand: OLDSMOBILE
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1190

Other P — Powertrain

Calibration Resistor Out Of Range

Brand: Other
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
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Code

P1190

RAM P — Powertrain

Inlet Air Pressure Sensor Circuit High

Brand: RAM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1190

SATURN P — Powertrain

Engine Vacuum Leak

Brand: SATURN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
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Keep it short and practical. Up to 500 characters.
Send to email
Code

P1190

SCION P — Powertrain

Intake air temperature sensor circuit

Brand: SCION
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
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Code

P1190

VOLKSWAGEN P — Powertrain

Linear Oxygen Sensor Reference Voltage Incorrect Signal

Brand: VOLKSWAGEN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vacuum or intake manifold leak on Bank 1
  • Faulty or contaminated upstream oxygen (O2) sensor / A/F sensor (Bank 1 Sensor 1)
  • Mass air flow (MAF) or MAP sensor fault or contamination
  • Low or erratic fuel pressure (weak pump, clogged filter, faulty regulator)
  • Fuel injector problem on Bank 1 (sticking, leaking, or electrical fault)
  • Wiring or connector fault to sensors or injectors (corrosion, open, short)

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Rough idle or unstable idle speed
  • Hesitation, stumbling or lack of power under load
  • Poor fuel economy
  • Increased tailpipe emissions
  • Possible misfire or engine surge

What to check

  • Read and record freeze-frame and stored/pending codes (scan tool)
  • Check live data: short-term and long-term fuel trims for Bank 1, upstream O2 sensor voltage/waveform
  • Inspect intake system for vacuum leaks, cracked hoses, loose clamps, and intake manifold gasket leaks
  • Visually inspect wiring and connectors to O2 sensors, MAF/MAP, fuel injectors and fuel pressure regulator
  • Measure fuel pressure at the fuel rail at idle and during cranking; compare to OEM spec
  • Inspect and clean MAF sensor if applicable (follow manufacturer cleaning procedure)

Signal parameters

  • Short-term fuel trim (STFT) % — Bank 1 (±% expected range)
  • Long-term fuel trim (LTFT) % — Bank 1 (typically ±10–15% normal, varies by vehicle)
  • Upstream O2/Air-Fuel sensor voltage (V) and switching frequency (Bank 1 Sensor 1)
  • Fuel rail pressure (psi or bar) at idle and during load
  • MAF sensor output (g/s or voltage) versus expected for RPM/load
  • Engine RPM (rpm) during tests

Diagnostic algorithm

  1. Confirm P1190 with a scan tool and note freeze-frame data and other stored codes.
  2. Check for related codes (e.g., fuel, O2, MAF, misfire) that can narrow causation.
  3. Visually inspect intake, vacuum lines, PCV, and intercooler piping (if applicable) for leaks or damage; repair any found.
  4. Perform a smoke test on the intake and vacuum system if a leak is suspected but not found visually.
  5. Monitor live data at idle and under load: compare STFT/LTFT and upstream O2 sensor behavior. Look for large positive LTFT (lean) or negative (rich) trends.
  6. Check MAF/MAP signals for plausibility. Clean MAF with proper cleaner if contaminated; retest.
  7. Measure fuel pressure static and dynamic against OEM specification. If low or fluctuating, inspect fuel pump, filter, and regulator.
  8. Inspect wiring/connectors to upstream O2 sensor and fuel injectors for corrosion, opens, or shorts. Wiggle-test while watching live data for intermittent faults.
  9. If fuel trims indicate a single cylinder issue, perform injector balance or cylinder drop test to isolate injector or ignition issues.
  10. If upstream O2 sensor output is implausible, swap with known-good sensor or follow manufacturer test procedure for sensor heating and signal response.
  11. After repairs or component replacements, erase codes and perform a road test to verify fuel trims and that P1190 does not return.
  12. If diagnosis is inconclusive, consult BMW technical service bulletins and consider dealer-level diagnostics for ECU/software issues.

Likely causes

  • Vacuum/intake leak or unmetered air causing lean pre-cat trim
  • Faulty upstream O2/air-fuel sensor producing incorrect feedback
  • Low fuel pressure or failing fuel delivery components

Fault status

⚠️ Status
Engine control module detected abnormal pre-catalyst fuel trim behavior on Bank 1. This indicates the engine is running outside expected fuel trim limits upstream of the catalytic converter and requires inspection of air/fuel sensing, fuel delivery, intake leaks, and related wiring/components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0171 P0174 P0101 P2195 P0300
626

Browse 626 VOLKSWAGEN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

VOLKSWAGEN

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