Possible Causes
WARNING: This page is about a different car, the 2003 Toyota Matrix and 2003 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
- DTC P0171 Only
Defective positive crankcase ventilation (PCV) hose. - DTC P0171 Only
Defective air induction system. - DTC P0171 Only
Injector blockage. - DTC P0172 Only
Injector leak, blockage. - DTC P0172 Only
Defective ignition system. - Defective mass air flow meter.
- Defective engine coolant temperature sensor.
- Improper fuel pressure.
- Gas leakage on exhaust system.
- Open or short in heated oxygen sensor circuit.
- Defective heated oxygen sensor.
- Defective ECM.