Possible Causes
WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
- Exhaust system leak.
- Front HO2S heater malfunction.
- Front HO2S deterioration.
- Fuel filter plugged or restricted.
- Fuel leak at fuel line, distribution pipe or fuel pump.
- Fuel pressure regulator malfunction.
- Fuel pump malfunction.
- Fuel return line plugged.
- Low compression.
- Misfire.
- Pressure Regulator Control (PRC) solenoid valve malfunction.
- Purge solenoid hoses improperly connected.
- Purge solenoid valve malfunction.