Code
P1116
BMW
P — Powertrain
Mass Or Volume Air Flow Circuit Range Performance Problem Bank 2
Views:
UK: 27
EN: 45
RU: 48
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
BUICK
P — Powertrain
ECT Signal Unstable Or Intermittent
Views:
UK: 29
EN: 59
RU: 49
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
CADILLAC
P — Powertrain
ECT Signal Unstable Or Intermittent
Views:
UK: 25
EN: 47
RU: 50
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
CHEVROLET
P — Powertrain
ECT Signal Unstable Or Intermittent
Views:
UK: 27
EN: 43
RU: 52
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
CHRYSLER
P — Powertrain
ECT Signal Unstable Or Intermittent
Views:
UK: 27
EN: 45
RU: 50
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
CITROEN
P — Powertrain
Upstream oxygen sensor auto-adaptive
Views:
UK: 3
EN: 10
RU: 12
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
DAEWOO
P — Powertrain
BOOSTER PRESSURE SNSR - GND/OPEN
Views:
UK: 4
EN: 8
RU: 10
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
DS
P — Powertrain
Upstream oxygen sensor auto-adaptive
Views:
UK: 3
EN: 12
RU: 6
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
FORD
P — Powertrain
Engine Coolant Temperature Sensor is Out of Self-Test Range
Views:
UK: 27
EN: 88
RU: 51
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
GM
P — Powertrain
ECT Signal Unstable Or Intermittent
Views:
UK: 30
EN: 49
RU: 51
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
GMC
P — Powertrain
ECT Signal Unstable Or Intermittent
Views:
UK: 26
EN: 51
RU: 52
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
HUMMER
P — Powertrain
ECT Signal Unstable or Intermittent
Views:
UK: 12
EN: 18
RU: 24
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
LAND ROVER
P — Powertrain
Engine Coolant Temperature Sensor Out of Range the self-test
Views:
UK: 3
EN: 10
RU: 16
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
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Code
P1116
LINCOLN
P — Powertrain
Engine Coolant Temperature Sensor is Out of Self-Test Range
Views:
UK: 23
EN: 54
RU: 49
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
MAZDA
P — Powertrain
ECT Sensor Circuit Out Of Self Test Range
Views:
UK: 32
EN: 64
RU: 63
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
MERCURY
P — Powertrain
Engine Coolant Temperature Sensor is Out of Self-Test Range
Views:
UK: 27
EN: 67
RU: 70
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
OLDSMOBILE
P — Powertrain
ECT Signal Unstable Or Intermittent
Views:
UK: 27
EN: 55
RU: 50
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
Other
P — Powertrain
Engine Coolant sensor out of range/ECT Sensor Out Of Self Test Range
Views:
UK: 31
EN: 83
RU: 60
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
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Workshop ManualYour experience will help others
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Code
P1116
PEUGEOT
P — Powertrain
Upstream oxygen sensor auto-adaptive
Views:
UK: 4
EN: 7
RU: 8
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P1116
SATURN
P — Powertrain
ECT Signal Unstable Or Intermittent
Views:
UK: 27
EN: 45
RU: 49
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
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Code
P1116
SUBARU
P — Powertrain
Engine Torque Control Cut Signal Circuit Low Input
Views:
UK: 27
EN: 50
RU: 48
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
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Code
P1116
VOLKSWAGEN
P — Powertrain
Oxygen Sensor Heater Circuit Open Bank 1 Sensor 1
Views:
UK: 26
EN: 47
RU: 59
AI status
Completed
Completed
100%
Causes
- Contaminated, damaged or failed mass air flow (MAF) sensor for Bank 2
- Air intake restriction or foreign object in intake tract
- Intake air leaks (vacuum, hoses, intercooler, charge pipe) downstream or upstream of the MAF
- Damaged, corroded or disconnected wiring and connectors to the MAF or associated grounds
- Incorrect or mismatched replacement MAF sensor or aftermarket intake modifications
- Faulty engine control module (ECM) or software/calibration issue
Symptoms
- Check Engine Light (MIL) illuminated
- Erratic idle, rough running or stalling
- Reduced engine power, hesitation or poor throttle response
- Poor fuel economy and/or rich or lean running
- Black exhaust smoke (if running rich)
- Surging or intermittent performance issues under load
What to check
- Read freeze frame and stored data to capture RPM, engine load, coolant temp, intake temp and MAF reading when the code set
- Scan live MAF sensor data (voltage, frequency or g/s) and compare to expected values for RPM/load
- Visually inspect air intake between air filter and intake manifold for leaks, loose clamps, torn boots or obstructions
- Inspect and wiggle MAF wiring harness and connector for corrosion, bent pins, damaged insulation or poor ground
- Check air filter condition and replace if heavily contaminated
- Perform a smoke or pressure test to locate intake leaks
Signal parameters
- Typical MAF output range: ~0.5–4.5 V (varies with sensor design) or sensor-specific frequency signal — consult vehicle specs
- MAF grams/sec (g/s) or lb/min should increase smoothly with RPM; abrupt jumps or flat lines indicate a problem
- At idle a low-flow engine may show small g/s (vehicle-specific) and higher g/s at higher RPM/load — compare to OEM data
- Heater/bridge element current/voltage should be within manufacturer limits (refer to service manual)
- Connector pin voltages: reference voltage (often 5V) and ground must be present at the MAF connector
Diagnostic algorithm
- Connect a professional scan tool. Record freeze-frame and live MAF data while reproducing the fault conditions.
- Visually inspect the intake system from airbox to manifold for leaks, loose clamps, torn boots, or restrictions. Repair as needed.
- Inspect the MAF connector and wiring for damage, corrosion, or poor contact. Repair damaged wiring and ensure good grounds.
- Clean the MAF sensor only with approved MAF cleaner if contamination is evident. Do not use other cleaners or touch the sensing element.
- If cleaning does not restore proper readings, bench-test or substitute a known-good MAF (OEM or correct part) and recheck live data.
- Perform a smoke test or pressure decay test to find any subtle intake or boost leaks affecting airflow readings.
- Verify reference voltages and heater/bridge circuit signals at the MAF connector per factory specifications. Repair wiring faults.
- If wiring and sensor test good and the code persists, check for ECM software updates or possible ECM failure and consult TSBs.
- Clear codes and perform a road test under the same conditions to confirm repair. Monitor for reoccurrence and re-check freeze frame if it returns.
Likely causes
- MAF sensor contamination or failure (most common)
- Intake tract leak between MAF and intake manifold
- Damaged wiring or poor connector contact at MAF harness
- Air filter clogged or severe restriction upstream of MAF
- Incorrect MAF calibration or non‑OEM sensor
- ECM fault (least common)
Fault status
Status
Mass or Volume Air Flow Circuit Range/Performance Problem — Bank 2. ECM detected MAF readings outside expected range or inconsistent with engine operating conditions for bank 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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0
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