DTC P0171 Or DTC P0172: Condition
WARNING: This page is about a different car, the 2002 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0171 is set when ECM (PCM) detects that total fuel trim of bank No. 1 is more than 33 percent. DTC P0172 is set when ECM (PCM) detects that total fuel trim of bank No. 1 is less than -33 percent. MIL is illuminated when ECM (PCM) detects malfunction during 2 consecutive drive cycles. Possible causes are:
- Intake system vacuum leaks.
- Exhaust system leaks.
- Incorrect fuel pressure.
- Fuel injector malfunction.
- HO2S Bank 1, Sensor 1 malfunction.
- Mass Air Flow (MAF) sensor malfunction.
- Engine Coolant Temperature (ECT) sensor malfunction.
- Fuel level sensor malfunction.