Possible Causes
- Front HO2S malfunction.
- Front HO2S heater malfunction.
- Fuel delivery hoses clogged or leaking.
- Fuel filter clogged.
- Fuel injector malfunction.
- Fuel pressure regulator malfunction.
- Fuel pump malfunction.
- Fuel return hose clogged or leaking.
- Ignition coil malfunction.
- Intake system malfunction.
- Low engine compression or engine malfunction.
- PCV valve malfunction.
- Purge solenoid valve malfunction.
- Purge solenoid valve hoses incorrectly installed.