Code
P1174
BMW
P — Powertrain
Fuel Trim Adaptation Additive Bank 1 Malfunction
AI status
Completed
Completed
100%
Causes
- Intake manifold or vacuum leak on bank 1
- Faulty or contaminated mass air flow (MAF) or manifold absolute pressure (MAP) sensor
- O2/AFR sensor or heater failure on bank 1
- Incorrect fuel pressure or weak fuel pump
- Leaking or clogged injector(s) on bank 1
- Wiring or connector faults to sensors or injectors
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Poor idle quality or rough running
- Reduced fuel economy
- Hesitation, stumbling or lack of power under load
- Black smoke or rich exhaust odor (if running rich) or lean hesitation
- Possible hard starting or unstable idle
What to check
- Read and record all stored and pending DTCs plus freeze frame data
- Monitor live data: short-term and long-term fuel trims for Bank 1, O2/AFR sensor voltages, MAF, MAP, RPM, throttle position and fuel trims
- Compare Bank 1 fuel trims against Bank 2 to see bank-specific discrepancy
- Visual inspection for vacuum/intake leaks, cracked hoses, and loose clamps on bank 1
- Inspect MAF and intake air system for contamination or damage
- Fuel pressure test at the rail during key-on and under load
Signal parameters
- Long-term fuel trim (LTFT) Bank 1 — expected near 0%, large positive/negative indicates adaptation issue
- Short-term fuel trim (STFT) Bank 1 — should oscillate around 0% during steady conditions
- Upstream O2/AFR sensor Bank 1 voltage or lambda signal and switching frequency
- MAF airflow (g/s) or MAP absolute pressure and response to throttle changes
- Fuel rail pressure (key-on, idle and under load)
- Injector Pulse Width and balance between injectors on bank 1
Diagnostic algorithm
- Retrieve all codes and freeze frame; note conditions when code set (engine load, temp, rpm).
- Monitor live data: compare STFT/LTFT for Bank 1 vs Bank 2 and observe O2/AFR sensor signals for proper switching and lambda control.
- Perform a visual inspection of intake, vacuum lines, PCV and manifold gaskets on Bank 1; repair any obvious leaks.
- Check MAF and intake air system for contamination or leaks. Clean or replace MAF if contaminated and verify readings.
- Test fuel pressure and compare to manufacturer specification; inspect fuel supply and regulator for proper operation.
- Perform injector balance or cylinder contribution test for cylinders on Bank 1; clean, service or replace leaking/clogged injectors as required.
- Test upstream O2/AFR sensor (voltage, switching, heater) on Bank 1; replace sensor if out of spec.
- Inspect wiring and connectors for injectors, O2 sensor, MAF/MAP and grounds; repair any damaged wiring or poor connections.
- If no mechanical/electrical faults found, clear adaptations and codes, then perform a controlled drive cycle to allow ECM to relearn fuel trims; confirm code does not return.
- If code returns after steps above, check for ECM software updates, module flash procedures or consider ECM fault and further manufacturer-specific diagnostics.
Likely causes
- Vacuum/intake leak on bank 1 (most common)
- Faulty upstream O2/AFR sensor causing incorrect feedback
- MAF sensor contamination or incorrect airflow signal
- Low fuel pressure or failing fuel injector(s) on bank 1
- Damaged wiring or poor ground to sensors on bank 1
Fault status
Status
Fuel Trim Adaptation Additive Bank 1 Malfunction — ECM has detected abnormal learned fuel trim/additive adaptation values for Bank 1. This indicates the control system cannot properly adapt fueling for that bank and may set the MIL. Check sensors, intake/fuel systems, injectors, wiring and ECM adaptations.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1174
DAEWOO
P — Powertrain
ETS VALVE STUCK - CLOSED 1
AI status
Completed
Completed
100%
Causes
- Intake manifold or vacuum leak on bank 1
- Faulty or contaminated mass air flow (MAF) or manifold absolute pressure (MAP) sensor
- O2/AFR sensor or heater failure on bank 1
- Incorrect fuel pressure or weak fuel pump
- Leaking or clogged injector(s) on bank 1
- Wiring or connector faults to sensors or injectors
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Poor idle quality or rough running
- Reduced fuel economy
- Hesitation, stumbling or lack of power under load
- Black smoke or rich exhaust odor (if running rich) or lean hesitation
- Possible hard starting or unstable idle
What to check
- Read and record all stored and pending DTCs plus freeze frame data
- Monitor live data: short-term and long-term fuel trims for Bank 1, O2/AFR sensor voltages, MAF, MAP, RPM, throttle position and fuel trims
- Compare Bank 1 fuel trims against Bank 2 to see bank-specific discrepancy
- Visual inspection for vacuum/intake leaks, cracked hoses, and loose clamps on bank 1
- Inspect MAF and intake air system for contamination or damage
- Fuel pressure test at the rail during key-on and under load
Signal parameters
- Long-term fuel trim (LTFT) Bank 1 — expected near 0%, large positive/negative indicates adaptation issue
- Short-term fuel trim (STFT) Bank 1 — should oscillate around 0% during steady conditions
- Upstream O2/AFR sensor Bank 1 voltage or lambda signal and switching frequency
- MAF airflow (g/s) or MAP absolute pressure and response to throttle changes
- Fuel rail pressure (key-on, idle and under load)
- Injector Pulse Width and balance between injectors on bank 1
Diagnostic algorithm
- Retrieve all codes and freeze frame; note conditions when code set (engine load, temp, rpm).
- Monitor live data: compare STFT/LTFT for Bank 1 vs Bank 2 and observe O2/AFR sensor signals for proper switching and lambda control.
- Perform a visual inspection of intake, vacuum lines, PCV and manifold gaskets on Bank 1; repair any obvious leaks.
- Check MAF and intake air system for contamination or leaks. Clean or replace MAF if contaminated and verify readings.
- Test fuel pressure and compare to manufacturer specification; inspect fuel supply and regulator for proper operation.
- Perform injector balance or cylinder contribution test for cylinders on Bank 1; clean, service or replace leaking/clogged injectors as required.
- Test upstream O2/AFR sensor (voltage, switching, heater) on Bank 1; replace sensor if out of spec.
- Inspect wiring and connectors for injectors, O2 sensor, MAF/MAP and grounds; repair any damaged wiring or poor connections.
- If no mechanical/electrical faults found, clear adaptations and codes, then perform a controlled drive cycle to allow ECM to relearn fuel trims; confirm code does not return.
- If code returns after steps above, check for ECM software updates, module flash procedures or consider ECM fault and further manufacturer-specific diagnostics.
Likely causes
- Vacuum/intake leak on bank 1 (most common)
- Faulty upstream O2/AFR sensor causing incorrect feedback
- MAF sensor contamination or incorrect airflow signal
- Low fuel pressure or failing fuel injector(s) on bank 1
- Damaged wiring or poor ground to sensors on bank 1
Fault status
Status
Fuel Trim Adaptation Additive Bank 1 Malfunction — ECM has detected abnormal learned fuel trim/additive adaptation values for Bank 1. This indicates the control system cannot properly adapt fueling for that bank and may set the MIL. Check sensors, intake/fuel systems, injectors, wiring and ECM adaptations.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
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
-
DAEWOO: 2001
-
Leganza
-
DAEWOO: 2000
-
Leganza
-
DAEWOO: 1999
-
Lanos
- S, 2D Hatchback, Automatic
- S, 2D Hatchback, Standard
- S, 4D Sedan, Automatic
- S, 4D Sedan, Standard
- SE, 2D Hatchback, Automatic
- SE, 2D Hatchback, Standard
- SE, 4D Sedan, Automatic
- SE, 4D Sedan, Standard
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- SX, 2D Hatchback, Standard
- SX, 4D Sedan, Automatic
- SX, 4D Sedan, Standard
-
Leganza
-
Nubira
- CDX, 4D Hatchback, Automatic
- CDX, 4D Hatchback, Standard
- CDX, 4D Sedan, Automatic
- CDX, 4D Sedan, Standard
- CDX, 4D Wagon, Automatic
- CDX, 4D Wagon, Standard
- SX, 4D Hatchback, Automatic
- SX, 4D Hatchback, Standard
- SX, 4D Sedan, Automatic
- SX, 4D Sedan, Standard
- SX, 4D Wagon, Automatic
- SX, 4D Wagon, Standard
-
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Code
P1174
FORD
P — Powertrain
Cam Sensor Fault
AI status
Completed
Completed
100%
Causes
- Intake manifold or vacuum leak on bank 1
- Faulty or contaminated mass air flow (MAF) or manifold absolute pressure (MAP) sensor
- O2/AFR sensor or heater failure on bank 1
- Incorrect fuel pressure or weak fuel pump
- Leaking or clogged injector(s) on bank 1
- Wiring or connector faults to sensors or injectors
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Poor idle quality or rough running
- Reduced fuel economy
- Hesitation, stumbling or lack of power under load
- Black smoke or rich exhaust odor (if running rich) or lean hesitation
- Possible hard starting or unstable idle
What to check
- Read and record all stored and pending DTCs plus freeze frame data
- Monitor live data: short-term and long-term fuel trims for Bank 1, O2/AFR sensor voltages, MAF, MAP, RPM, throttle position and fuel trims
- Compare Bank 1 fuel trims against Bank 2 to see bank-specific discrepancy
- Visual inspection for vacuum/intake leaks, cracked hoses, and loose clamps on bank 1
- Inspect MAF and intake air system for contamination or damage
- Fuel pressure test at the rail during key-on and under load
Signal parameters
- Long-term fuel trim (LTFT) Bank 1 — expected near 0%, large positive/negative indicates adaptation issue
- Short-term fuel trim (STFT) Bank 1 — should oscillate around 0% during steady conditions
- Upstream O2/AFR sensor Bank 1 voltage or lambda signal and switching frequency
- MAF airflow (g/s) or MAP absolute pressure and response to throttle changes
- Fuel rail pressure (key-on, idle and under load)
- Injector Pulse Width and balance between injectors on bank 1
Diagnostic algorithm
- Retrieve all codes and freeze frame; note conditions when code set (engine load, temp, rpm).
- Monitor live data: compare STFT/LTFT for Bank 1 vs Bank 2 and observe O2/AFR sensor signals for proper switching and lambda control.
- Perform a visual inspection of intake, vacuum lines, PCV and manifold gaskets on Bank 1; repair any obvious leaks.
- Check MAF and intake air system for contamination or leaks. Clean or replace MAF if contaminated and verify readings.
- Test fuel pressure and compare to manufacturer specification; inspect fuel supply and regulator for proper operation.
- Perform injector balance or cylinder contribution test for cylinders on Bank 1; clean, service or replace leaking/clogged injectors as required.
- Test upstream O2/AFR sensor (voltage, switching, heater) on Bank 1; replace sensor if out of spec.
- Inspect wiring and connectors for injectors, O2 sensor, MAF/MAP and grounds; repair any damaged wiring or poor connections.
- If no mechanical/electrical faults found, clear adaptations and codes, then perform a controlled drive cycle to allow ECM to relearn fuel trims; confirm code does not return.
- If code returns after steps above, check for ECM software updates, module flash procedures or consider ECM fault and further manufacturer-specific diagnostics.
Likely causes
- Vacuum/intake leak on bank 1 (most common)
- Faulty upstream O2/AFR sensor causing incorrect feedback
- MAF sensor contamination or incorrect airflow signal
- Low fuel pressure or failing fuel injector(s) on bank 1
- Damaged wiring or poor ground to sensors on bank 1
Fault status
Status
Fuel Trim Adaptation Additive Bank 1 Malfunction — ECM has detected abnormal learned fuel trim/additive adaptation values for Bank 1. This indicates the control system cannot properly adapt fueling for that bank and may set the MIL. Check sensors, intake/fuel systems, injectors, wiring and ECM adaptations.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1174
Generic
P — Powertrain
Cam Sensor Fault
AI status
Completed
Completed
100%
Causes
- Intake manifold or vacuum leak on bank 1
- Faulty or contaminated mass air flow (MAF) or manifold absolute pressure (MAP) sensor
- O2/AFR sensor or heater failure on bank 1
- Incorrect fuel pressure or weak fuel pump
- Leaking or clogged injector(s) on bank 1
- Wiring or connector faults to sensors or injectors
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Poor idle quality or rough running
- Reduced fuel economy
- Hesitation, stumbling or lack of power under load
- Black smoke or rich exhaust odor (if running rich) or lean hesitation
- Possible hard starting or unstable idle
What to check
- Read and record all stored and pending DTCs plus freeze frame data
- Monitor live data: short-term and long-term fuel trims for Bank 1, O2/AFR sensor voltages, MAF, MAP, RPM, throttle position and fuel trims
- Compare Bank 1 fuel trims against Bank 2 to see bank-specific discrepancy
- Visual inspection for vacuum/intake leaks, cracked hoses, and loose clamps on bank 1
- Inspect MAF and intake air system for contamination or damage
- Fuel pressure test at the rail during key-on and under load
Signal parameters
- Long-term fuel trim (LTFT) Bank 1 — expected near 0%, large positive/negative indicates adaptation issue
- Short-term fuel trim (STFT) Bank 1 — should oscillate around 0% during steady conditions
- Upstream O2/AFR sensor Bank 1 voltage or lambda signal and switching frequency
- MAF airflow (g/s) or MAP absolute pressure and response to throttle changes
- Fuel rail pressure (key-on, idle and under load)
- Injector Pulse Width and balance between injectors on bank 1
Diagnostic algorithm
- Retrieve all codes and freeze frame; note conditions when code set (engine load, temp, rpm).
- Monitor live data: compare STFT/LTFT for Bank 1 vs Bank 2 and observe O2/AFR sensor signals for proper switching and lambda control.
- Perform a visual inspection of intake, vacuum lines, PCV and manifold gaskets on Bank 1; repair any obvious leaks.
- Check MAF and intake air system for contamination or leaks. Clean or replace MAF if contaminated and verify readings.
- Test fuel pressure and compare to manufacturer specification; inspect fuel supply and regulator for proper operation.
- Perform injector balance or cylinder contribution test for cylinders on Bank 1; clean, service or replace leaking/clogged injectors as required.
- Test upstream O2/AFR sensor (voltage, switching, heater) on Bank 1; replace sensor if out of spec.
- Inspect wiring and connectors for injectors, O2 sensor, MAF/MAP and grounds; repair any damaged wiring or poor connections.
- If no mechanical/electrical faults found, clear adaptations and codes, then perform a controlled drive cycle to allow ECM to relearn fuel trims; confirm code does not return.
- If code returns after steps above, check for ECM software updates, module flash procedures or consider ECM fault and further manufacturer-specific diagnostics.
Likely causes
- Vacuum/intake leak on bank 1 (most common)
- Faulty upstream O2/AFR sensor causing incorrect feedback
- MAF sensor contamination or incorrect airflow signal
- Low fuel pressure or failing fuel injector(s) on bank 1
- Damaged wiring or poor ground to sensors on bank 1
Fault status
Status
Fuel Trim Adaptation Additive Bank 1 Malfunction — ECM has detected abnormal learned fuel trim/additive adaptation values for Bank 1. This indicates the control system cannot properly adapt fueling for that bank and may set the MIL. Check sensors, intake/fuel systems, injectors, wiring and ECM adaptations.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Repair manuals
Brands with available manuals
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Code
P1174
JAGUAR
P — Powertrain
System Too Lean Banks 1 And 2 (Suspect HO2S)
AI status
Completed
Completed
100%
Causes
- Intake manifold or vacuum leak on bank 1
- Faulty or contaminated mass air flow (MAF) or manifold absolute pressure (MAP) sensor
- O2/AFR sensor or heater failure on bank 1
- Incorrect fuel pressure or weak fuel pump
- Leaking or clogged injector(s) on bank 1
- Wiring or connector faults to sensors or injectors
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Poor idle quality or rough running
- Reduced fuel economy
- Hesitation, stumbling or lack of power under load
- Black smoke or rich exhaust odor (if running rich) or lean hesitation
- Possible hard starting or unstable idle
What to check
- Read and record all stored and pending DTCs plus freeze frame data
- Monitor live data: short-term and long-term fuel trims for Bank 1, O2/AFR sensor voltages, MAF, MAP, RPM, throttle position and fuel trims
- Compare Bank 1 fuel trims against Bank 2 to see bank-specific discrepancy
- Visual inspection for vacuum/intake leaks, cracked hoses, and loose clamps on bank 1
- Inspect MAF and intake air system for contamination or damage
- Fuel pressure test at the rail during key-on and under load
Signal parameters
- Long-term fuel trim (LTFT) Bank 1 — expected near 0%, large positive/negative indicates adaptation issue
- Short-term fuel trim (STFT) Bank 1 — should oscillate around 0% during steady conditions
- Upstream O2/AFR sensor Bank 1 voltage or lambda signal and switching frequency
- MAF airflow (g/s) or MAP absolute pressure and response to throttle changes
- Fuel rail pressure (key-on, idle and under load)
- Injector Pulse Width and balance between injectors on bank 1
Diagnostic algorithm
- Retrieve all codes and freeze frame; note conditions when code set (engine load, temp, rpm).
- Monitor live data: compare STFT/LTFT for Bank 1 vs Bank 2 and observe O2/AFR sensor signals for proper switching and lambda control.
- Perform a visual inspection of intake, vacuum lines, PCV and manifold gaskets on Bank 1; repair any obvious leaks.
- Check MAF and intake air system for contamination or leaks. Clean or replace MAF if contaminated and verify readings.
- Test fuel pressure and compare to manufacturer specification; inspect fuel supply and regulator for proper operation.
- Perform injector balance or cylinder contribution test for cylinders on Bank 1; clean, service or replace leaking/clogged injectors as required.
- Test upstream O2/AFR sensor (voltage, switching, heater) on Bank 1; replace sensor if out of spec.
- Inspect wiring and connectors for injectors, O2 sensor, MAF/MAP and grounds; repair any damaged wiring or poor connections.
- If no mechanical/electrical faults found, clear adaptations and codes, then perform a controlled drive cycle to allow ECM to relearn fuel trims; confirm code does not return.
- If code returns after steps above, check for ECM software updates, module flash procedures or consider ECM fault and further manufacturer-specific diagnostics.
Likely causes
- Vacuum/intake leak on bank 1 (most common)
- Faulty upstream O2/AFR sensor causing incorrect feedback
- MAF sensor contamination or incorrect airflow signal
- Low fuel pressure or failing fuel injector(s) on bank 1
- Damaged wiring or poor ground to sensors on bank 1
Fault status
Status
Fuel Trim Adaptation Additive Bank 1 Malfunction — ECM has detected abnormal learned fuel trim/additive adaptation values for Bank 1. This indicates the control system cannot properly adapt fueling for that bank and may set the MIL. Check sensors, intake/fuel systems, injectors, wiring and ECM adaptations.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P1174
LINCOLN
P — Powertrain
Cam Sensor Fault
AI status
Completed
Completed
100%
Causes
- Intake manifold or vacuum leak on bank 1
- Faulty or contaminated mass air flow (MAF) or manifold absolute pressure (MAP) sensor
- O2/AFR sensor or heater failure on bank 1
- Incorrect fuel pressure or weak fuel pump
- Leaking or clogged injector(s) on bank 1
- Wiring or connector faults to sensors or injectors
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Poor idle quality or rough running
- Reduced fuel economy
- Hesitation, stumbling or lack of power under load
- Black smoke or rich exhaust odor (if running rich) or lean hesitation
- Possible hard starting or unstable idle
What to check
- Read and record all stored and pending DTCs plus freeze frame data
- Monitor live data: short-term and long-term fuel trims for Bank 1, O2/AFR sensor voltages, MAF, MAP, RPM, throttle position and fuel trims
- Compare Bank 1 fuel trims against Bank 2 to see bank-specific discrepancy
- Visual inspection for vacuum/intake leaks, cracked hoses, and loose clamps on bank 1
- Inspect MAF and intake air system for contamination or damage
- Fuel pressure test at the rail during key-on and under load
Signal parameters
- Long-term fuel trim (LTFT) Bank 1 — expected near 0%, large positive/negative indicates adaptation issue
- Short-term fuel trim (STFT) Bank 1 — should oscillate around 0% during steady conditions
- Upstream O2/AFR sensor Bank 1 voltage or lambda signal and switching frequency
- MAF airflow (g/s) or MAP absolute pressure and response to throttle changes
- Fuel rail pressure (key-on, idle and under load)
- Injector Pulse Width and balance between injectors on bank 1
Diagnostic algorithm
- Retrieve all codes and freeze frame; note conditions when code set (engine load, temp, rpm).
- Monitor live data: compare STFT/LTFT for Bank 1 vs Bank 2 and observe O2/AFR sensor signals for proper switching and lambda control.
- Perform a visual inspection of intake, vacuum lines, PCV and manifold gaskets on Bank 1; repair any obvious leaks.
- Check MAF and intake air system for contamination or leaks. Clean or replace MAF if contaminated and verify readings.
- Test fuel pressure and compare to manufacturer specification; inspect fuel supply and regulator for proper operation.
- Perform injector balance or cylinder contribution test for cylinders on Bank 1; clean, service or replace leaking/clogged injectors as required.
- Test upstream O2/AFR sensor (voltage, switching, heater) on Bank 1; replace sensor if out of spec.
- Inspect wiring and connectors for injectors, O2 sensor, MAF/MAP and grounds; repair any damaged wiring or poor connections.
- If no mechanical/electrical faults found, clear adaptations and codes, then perform a controlled drive cycle to allow ECM to relearn fuel trims; confirm code does not return.
- If code returns after steps above, check for ECM software updates, module flash procedures or consider ECM fault and further manufacturer-specific diagnostics.
Likely causes
- Vacuum/intake leak on bank 1 (most common)
- Faulty upstream O2/AFR sensor causing incorrect feedback
- MAF sensor contamination or incorrect airflow signal
- Low fuel pressure or failing fuel injector(s) on bank 1
- Damaged wiring or poor ground to sensors on bank 1
Fault status
Status
Fuel Trim Adaptation Additive Bank 1 Malfunction — ECM has detected abnormal learned fuel trim/additive adaptation values for Bank 1. This indicates the control system cannot properly adapt fueling for that bank and may set the MIL. Check sensors, intake/fuel systems, injectors, wiring and ECM adaptations.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Repair manuals
Manual library for LINCOLN
166
Browse 166 LINCOLN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
LINCOLN
-
LINCOLN: 2024
-
LINCOLN: 2023
-
LINCOLN: 2022
-
LINCOLN: 2021
-
LINCOLN: 2020
-
Continental
- Base, AWD
- Base, FWD
- Black Label, 2.7L Eng VIN P · 2.7L Eng VIN P2020: Continental Black Label
- Black Label, 3.0L Eng VIN C · 3.0L Eng VIN C2020: Continental Black Label
- Livery, AWD
- Livery, FWD
- Reserve, 2.7L Eng VIN P, AWD
- Reserve, 2.7L Eng VIN P, FWD
- Reserve, 3.0L Eng VIN C · 3.0L Eng VIN C2020: Continental Reserve
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Code
P1174
MERCURY
P — Powertrain
Cam Sensor Fault
AI status
Completed
Completed
100%
Causes
- Intake manifold or vacuum leak on bank 1
- Faulty or contaminated mass air flow (MAF) or manifold absolute pressure (MAP) sensor
- O2/AFR sensor or heater failure on bank 1
- Incorrect fuel pressure or weak fuel pump
- Leaking or clogged injector(s) on bank 1
- Wiring or connector faults to sensors or injectors
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Poor idle quality or rough running
- Reduced fuel economy
- Hesitation, stumbling or lack of power under load
- Black smoke or rich exhaust odor (if running rich) or lean hesitation
- Possible hard starting or unstable idle
What to check
- Read and record all stored and pending DTCs plus freeze frame data
- Monitor live data: short-term and long-term fuel trims for Bank 1, O2/AFR sensor voltages, MAF, MAP, RPM, throttle position and fuel trims
- Compare Bank 1 fuel trims against Bank 2 to see bank-specific discrepancy
- Visual inspection for vacuum/intake leaks, cracked hoses, and loose clamps on bank 1
- Inspect MAF and intake air system for contamination or damage
- Fuel pressure test at the rail during key-on and under load
Signal parameters
- Long-term fuel trim (LTFT) Bank 1 — expected near 0%, large positive/negative indicates adaptation issue
- Short-term fuel trim (STFT) Bank 1 — should oscillate around 0% during steady conditions
- Upstream O2/AFR sensor Bank 1 voltage or lambda signal and switching frequency
- MAF airflow (g/s) or MAP absolute pressure and response to throttle changes
- Fuel rail pressure (key-on, idle and under load)
- Injector Pulse Width and balance between injectors on bank 1
Diagnostic algorithm
- Retrieve all codes and freeze frame; note conditions when code set (engine load, temp, rpm).
- Monitor live data: compare STFT/LTFT for Bank 1 vs Bank 2 and observe O2/AFR sensor signals for proper switching and lambda control.
- Perform a visual inspection of intake, vacuum lines, PCV and manifold gaskets on Bank 1; repair any obvious leaks.
- Check MAF and intake air system for contamination or leaks. Clean or replace MAF if contaminated and verify readings.
- Test fuel pressure and compare to manufacturer specification; inspect fuel supply and regulator for proper operation.
- Perform injector balance or cylinder contribution test for cylinders on Bank 1; clean, service or replace leaking/clogged injectors as required.
- Test upstream O2/AFR sensor (voltage, switching, heater) on Bank 1; replace sensor if out of spec.
- Inspect wiring and connectors for injectors, O2 sensor, MAF/MAP and grounds; repair any damaged wiring or poor connections.
- If no mechanical/electrical faults found, clear adaptations and codes, then perform a controlled drive cycle to allow ECM to relearn fuel trims; confirm code does not return.
- If code returns after steps above, check for ECM software updates, module flash procedures or consider ECM fault and further manufacturer-specific diagnostics.
Likely causes
- Vacuum/intake leak on bank 1 (most common)
- Faulty upstream O2/AFR sensor causing incorrect feedback
- MAF sensor contamination or incorrect airflow signal
- Low fuel pressure or failing fuel injector(s) on bank 1
- Damaged wiring or poor ground to sensors on bank 1
Fault status
Status
Fuel Trim Adaptation Additive Bank 1 Malfunction — ECM has detected abnormal learned fuel trim/additive adaptation values for Bank 1. This indicates the control system cannot properly adapt fueling for that bank and may set the MIL. Check sensors, intake/fuel systems, injectors, wiring and ECM adaptations.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Repair manuals
Manual library for MERCURY
296
Browse 296 MERCURY manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
MERCURY
-
MERCURY: 2011
-
MERCURY: 2010
-
Mountaineer
-
MERCURY: 2009
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Mountaineer
-
MERCURY: 2008
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Mountaineer
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MERCURY: 2007
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Monterey
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Mountaineer
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MERCURY: 2006
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Montego
-
Monterey
-
Mountaineer
-
MERCURY: 2005
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Monterey
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MERCURY: 2004
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-
MERCURY: 2001
-
Mountaineer
-
Sable
- GS, 4D Sedan, 3.0 2, 4F50N
- GS, 4D Sedan, 3.0 2, AX4S
- GS, 4D Sedan, 3.0 S
- GS, 4D Sedan, 3.0 U, 4F50N
- GS, 4D Sedan, 3.0 U, AX4S
- GS, 4D Wagon, 3.0 2, 4F50N
- GS, 4D Wagon, 3.0 2, AX4S
- GS, 4D Wagon, 3.0 U, 4F50N
- GS, 4D Wagon, 3.0 U, AX4S
- LS, 4D Sedan, 3.0 2
- LS, 4D Sedan, 3.0 S
- LS, 4D Sedan, 3.0 U, 4F50N
- LS, 4D Sedan, 3.0 U, AX4S
- LS, 4D Wagon, 3.0 S
- LS, 4D Wagon, 3.0 U, 4F50N
- LS, 4D Wagon, 3.0 U, AX4S
-
Villager
-
MERCURY: 2000
-
Cougar
-
Mountaineer
-
Villager
-
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Code
P1174
Other
P — Powertrain
Cam Sensor Fault
AI status
Completed
Completed
100%
Causes
- Intake manifold or vacuum leak on bank 1
- Faulty or contaminated mass air flow (MAF) or manifold absolute pressure (MAP) sensor
- O2/AFR sensor or heater failure on bank 1
- Incorrect fuel pressure or weak fuel pump
- Leaking or clogged injector(s) on bank 1
- Wiring or connector faults to sensors or injectors
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Poor idle quality or rough running
- Reduced fuel economy
- Hesitation, stumbling or lack of power under load
- Black smoke or rich exhaust odor (if running rich) or lean hesitation
- Possible hard starting or unstable idle
What to check
- Read and record all stored and pending DTCs plus freeze frame data
- Monitor live data: short-term and long-term fuel trims for Bank 1, O2/AFR sensor voltages, MAF, MAP, RPM, throttle position and fuel trims
- Compare Bank 1 fuel trims against Bank 2 to see bank-specific discrepancy
- Visual inspection for vacuum/intake leaks, cracked hoses, and loose clamps on bank 1
- Inspect MAF and intake air system for contamination or damage
- Fuel pressure test at the rail during key-on and under load
Signal parameters
- Long-term fuel trim (LTFT) Bank 1 — expected near 0%, large positive/negative indicates adaptation issue
- Short-term fuel trim (STFT) Bank 1 — should oscillate around 0% during steady conditions
- Upstream O2/AFR sensor Bank 1 voltage or lambda signal and switching frequency
- MAF airflow (g/s) or MAP absolute pressure and response to throttle changes
- Fuel rail pressure (key-on, idle and under load)
- Injector Pulse Width and balance between injectors on bank 1
Diagnostic algorithm
- Retrieve all codes and freeze frame; note conditions when code set (engine load, temp, rpm).
- Monitor live data: compare STFT/LTFT for Bank 1 vs Bank 2 and observe O2/AFR sensor signals for proper switching and lambda control.
- Perform a visual inspection of intake, vacuum lines, PCV and manifold gaskets on Bank 1; repair any obvious leaks.
- Check MAF and intake air system for contamination or leaks. Clean or replace MAF if contaminated and verify readings.
- Test fuel pressure and compare to manufacturer specification; inspect fuel supply and regulator for proper operation.
- Perform injector balance or cylinder contribution test for cylinders on Bank 1; clean, service or replace leaking/clogged injectors as required.
- Test upstream O2/AFR sensor (voltage, switching, heater) on Bank 1; replace sensor if out of spec.
- Inspect wiring and connectors for injectors, O2 sensor, MAF/MAP and grounds; repair any damaged wiring or poor connections.
- If no mechanical/electrical faults found, clear adaptations and codes, then perform a controlled drive cycle to allow ECM to relearn fuel trims; confirm code does not return.
- If code returns after steps above, check for ECM software updates, module flash procedures or consider ECM fault and further manufacturer-specific diagnostics.
Likely causes
- Vacuum/intake leak on bank 1 (most common)
- Faulty upstream O2/AFR sensor causing incorrect feedback
- MAF sensor contamination or incorrect airflow signal
- Low fuel pressure or failing fuel injector(s) on bank 1
- Damaged wiring or poor ground to sensors on bank 1
Fault status
Status
Fuel Trim Adaptation Additive Bank 1 Malfunction — ECM has detected abnormal learned fuel trim/additive adaptation values for Bank 1. This indicates the control system cannot properly adapt fueling for that bank and may set the MIL. Check sensors, intake/fuel systems, injectors, wiring and ECM adaptations.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Repair manuals
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Code
P1174
VOLKSWAGEN
P — Powertrain
Fuel Trim Bank 1 Different Injection Times
AI status
Completed
Completed
100%
Causes
- Intake manifold or vacuum leak on bank 1
- Faulty or contaminated mass air flow (MAF) or manifold absolute pressure (MAP) sensor
- O2/AFR sensor or heater failure on bank 1
- Incorrect fuel pressure or weak fuel pump
- Leaking or clogged injector(s) on bank 1
- Wiring or connector faults to sensors or injectors
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Poor idle quality or rough running
- Reduced fuel economy
- Hesitation, stumbling or lack of power under load
- Black smoke or rich exhaust odor (if running rich) or lean hesitation
- Possible hard starting or unstable idle
What to check
- Read and record all stored and pending DTCs plus freeze frame data
- Monitor live data: short-term and long-term fuel trims for Bank 1, O2/AFR sensor voltages, MAF, MAP, RPM, throttle position and fuel trims
- Compare Bank 1 fuel trims against Bank 2 to see bank-specific discrepancy
- Visual inspection for vacuum/intake leaks, cracked hoses, and loose clamps on bank 1
- Inspect MAF and intake air system for contamination or damage
- Fuel pressure test at the rail during key-on and under load
Signal parameters
- Long-term fuel trim (LTFT) Bank 1 — expected near 0%, large positive/negative indicates adaptation issue
- Short-term fuel trim (STFT) Bank 1 — should oscillate around 0% during steady conditions
- Upstream O2/AFR sensor Bank 1 voltage or lambda signal and switching frequency
- MAF airflow (g/s) or MAP absolute pressure and response to throttle changes
- Fuel rail pressure (key-on, idle and under load)
- Injector Pulse Width and balance between injectors on bank 1
Diagnostic algorithm
- Retrieve all codes and freeze frame; note conditions when code set (engine load, temp, rpm).
- Monitor live data: compare STFT/LTFT for Bank 1 vs Bank 2 and observe O2/AFR sensor signals for proper switching and lambda control.
- Perform a visual inspection of intake, vacuum lines, PCV and manifold gaskets on Bank 1; repair any obvious leaks.
- Check MAF and intake air system for contamination or leaks. Clean or replace MAF if contaminated and verify readings.
- Test fuel pressure and compare to manufacturer specification; inspect fuel supply and regulator for proper operation.
- Perform injector balance or cylinder contribution test for cylinders on Bank 1; clean, service or replace leaking/clogged injectors as required.
- Test upstream O2/AFR sensor (voltage, switching, heater) on Bank 1; replace sensor if out of spec.
- Inspect wiring and connectors for injectors, O2 sensor, MAF/MAP and grounds; repair any damaged wiring or poor connections.
- If no mechanical/electrical faults found, clear adaptations and codes, then perform a controlled drive cycle to allow ECM to relearn fuel trims; confirm code does not return.
- If code returns after steps above, check for ECM software updates, module flash procedures or consider ECM fault and further manufacturer-specific diagnostics.
Likely causes
- Vacuum/intake leak on bank 1 (most common)
- Faulty upstream O2/AFR sensor causing incorrect feedback
- MAF sensor contamination or incorrect airflow signal
- Low fuel pressure or failing fuel injector(s) on bank 1
- Damaged wiring or poor ground to sensors on bank 1
Fault status
Status
Fuel Trim Adaptation Additive Bank 1 Malfunction — ECM has detected abnormal learned fuel trim/additive adaptation values for Bank 1. This indicates the control system cannot properly adapt fueling for that bank and may set the MIL. Check sensors, intake/fuel systems, injectors, wiring and ECM adaptations.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Repair manuals
Manual library for VOLKSWAGEN
139
Browse 139 VOLKSWAGEN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
VOLKSWAGEN
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VOLKSWAGEN: 2021
-
Atlas
- S, AWD
- S, FWD
- SE, 2.0L Eng VIN P, AWD
- SE, 2.0L Eng VIN P, FWD
- SE, 3.6L Eng VIN R, AWD
- SE, 3.6L Eng VIN R, FWD
- SEL, 2.0L Eng VIN P · 2.0L Eng VIN P2021: Atlas SEL
- SEL, 3.6L Eng VIN R, AWD
- SEL, 3.6L Eng VIN R, FWD
- SEL Premium, 2.0L Eng VIN P · 2.0L Eng VIN P2021: Atlas SEL Premium
- SEL Premium, 3.6L Eng VIN R · 3.6L Eng VIN R2021: Atlas SEL Premium
- SEL Premium R-Line
- SEL R-Line, AWD
- SEL R-Line, FWD
- SE R-Line, AWD
- SE R-Line, FWD
-
Atlas Cross Sport
- S, AWD
- S, FWD
- SE, 2.0L Eng VIN C, AWD
- SE, 2.0L Eng VIN C, FWD
- SE, 3.6L Eng VIN E, AWD
- SE, 3.6L Eng VIN E, FWD
- SEL, 2.0L Eng VIN C · 2.0L Eng VIN C2021: Atlas Cross Sport SEL
- SEL, 3.6L Eng VIN E, AWD
- SEL, 3.6L Eng VIN E, FWD
- SEL Premium, 2.0L Eng VIN C · 2.0L Eng VIN C2021: Atlas Cross Sport SEL Premium
- SEL Premium, 3.6L Eng VIN E · 3.6L Eng VIN E2021: Atlas Cross Sport SEL Premium
- SEL Premium R-Line
- SEL R-Line, AWD
- SEL R-Line, FWD
- SE R-Line, AWD
- SE R-Line, FWD
-
VOLKSWAGEN: 2020
-
Atlas
- S, 2.0L Eng VIN P · 2.0L Eng VIN P2020: Atlas S
- S, 3.6L Eng VIN R · 3.6L Eng VIN R2020: Atlas S
- SE, 2.0L Eng VIN P · 2.0L Eng VIN P2020: Atlas SE
- SE, 3.6L Eng VIN R, AWD
- SE, 3.6L Eng VIN R, FWD
- SEL, 2.0L Eng VIN P · 2.0L Eng VIN P2020: Atlas SEL
- SEL, 3.6L Eng VIN R, AWD
- SEL, 3.6L Eng VIN R, FWD
- SEL Premium
- SEL R-Line, AWD
- SEL R-Line, FWD
- SE R-Line, AWD
- SE R-Line, FWD
-
Atlas Cross Sport
- S, AWD
- S, FWD
- SE, 2.0L Eng VIN C, AWD
- SE, 2.0L Eng VIN C, FWD
- SE, 3.6L Eng VIN E, AWD
- SE, 3.6L Eng VIN E, FWD
- SEL, 2.0L Eng VIN C, AWD
- SEL, 2.0L Eng VIN C, FWD
- SEL, 3.6L Eng VIN E, AWD
- SEL, 3.6L Eng VIN E, FWD
- SEL Premium
- SEL Premium R-Line
- SEL R-Line, AWD
- SEL R-Line, FWD
- SE R-Line, AWD
- SE R-Line, FWD
-
Jetta
- GLI Autobahn, Automatic DCT Trans
- GLI Autobahn, Standard Trans
- GLI S, Automatic DCT Trans
- GLI S, Standard Trans
- R-Line, 1.4L Eng VIN 5, Automatic Trans
- R-Line, 1.4L Eng VIN 5, Standard Trans
- R-Line, 1.4L Eng VIN B · 1.4L Eng VIN B2020: Jetta R-Line
- S, 1.4L Eng VIN 5, Automatic Trans
- S, 1.4L Eng VIN 5, Standard Trans
- S, 1.4L Eng VIN B · 1.4L Eng VIN B2020: Jetta S
- SE, 1.4L Eng VIN 5 · 1.4L Eng VIN 52020: Jetta SE
- SE, 1.4L Eng VIN B · 1.4L Eng VIN B2020: Jetta SE
- SEL, 1.4L Eng VIN 5 · 1.4L Eng VIN 52020: Jetta SEL
- SEL, 1.4L Eng VIN B · 1.4L Eng VIN B2020: Jetta SEL
- SEL Premium, 1.4L Eng VIN 5 · 1.4L Eng VIN 52020: Jetta SEL Premium
- SEL Premium, 1.4L Eng VIN B · 1.4L Eng VIN B2020: Jetta SEL Premium
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