Possible Causes
- Engine misfire.
- Air intake leak between MAF sensor and throttle.
- Fuel filter or fuel system blockage.
- Fuel injector blockage.
- Fuel pressure regulator failure (low fuel pressure).
- Low fuel pump output.
- HO2S wiring harness condition fault.
- Exhaust leak before catalyst.
- ECM receiving incorrect signal from one or more of the following components: ECT sensor, MAF sensor, IAT sensor or TPS.