DTC P0171:00, P0174:00: Notes
WARNING: This page is about a different variant/trim than selected.
| DTC P0171:00 |
P0171:00: System too lean (RH) |
| DTC P0174:00 |
P0174:00: System too lean (LH) |
| DETECTION CONDITION |
- P0171:00 indicates that the fuel/air ratio is too lean (RH).
- P0174:00 indicates that the fuel/air ratio is too lean (LH).
- The adaptive fuel strategy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit.
|
| POSSIBLE CAUSE |
Fuel System:
- Damaged or worn fuel pump
- Leaking fuel pump check valve
- Ethanol content in fuel
- Fuel supply line restricted
- Damaged or leaking fuel pulse damper
- Fuel filter plugged or dirty
- Low fuel pressure or fuel nearly depleted
- Purge solenoid valve is leaking when canister is clean
- Leaking/contaminated fuel injectors
Exhaust System:
- Exhaust leaks in exhaust manifold gasket or mating gaskets before or near the A/F sensor
Intake Air System:
- Vacuum leaks
- PCV system is leaking or valve is stuck open
- Air leaks after MAF sensor
- Improperly seated engine oil dipstick
- Intake air turbulence due to incorrect air filter
- Contaminated MAF sensor
Electrical System:
- MAF sensor malfunction
- PCM malfunction
|