Possible Causes
WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
Possible causes are:
- Air suction or leakage
- Engine malfunction
- Front HO2S heater malfunction
- Front HO2S malfunction
- Fuel delivery hose clogging or leakage
- Fuel filter clogging
- Fuel injector malfunction
- Fuel pump malfunction
- Fuel return hose clogging or leakage
- Ignition coil malfunction
- Insufficient compression
- PCV valve malfunction
- Pressure regulator malfunction
- Purge solenoid hoses are hooked up incorrectly
- Purge solenoid valve malfunction