Symptoms:
- Check the engine soon warning light
- Diminished engine performance
- Hissing noises
- Hesitation when the throttle is engaged
- Engine stalling/ will not start
Causes:
- Faulty oxygen sensor
- Malfunctioning coolant temperature sensor
- Faulty fuel pressure regulator
- Faulty manifold air pressure sensor
- Malfunctioning mass air flow sensor
- Contaminated engine oil
- Engine leaks upstream from the catalytic converter
- Engine is misfiring
- Loose or damaged wires and connectors
Possible Solutions:
- Replacement of oxygen sensors
- New wiring or electrical connectors
- Fix engine leaks
- Replacement of the mass air flow sensor
- Replacement of the manifold air pressure sensor
- Replacement of the fuel pressure regulator
- Replacement of the coolant temperature sensor
- Replacement of the Catalytic Converter