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Topic starter 20/03/2019 3:47 pm
Description
Indicates that front oxygen sensor (at the input of catalytic converter) detects lower than expected percentage of oxygen in exhaust gasses. Could be due to the unbalanced air-to-fuel proportion at the engine, fault oxygen sensor or other systems.
Symptoms
- Check Engine dashboard light is ON
- Possible lack of power and car dynamic
- Possible increase of fuel consumption
- Possible misfire issues
- Unstable work and sound from engine: stumbles, shakes
Causes
- Faulty or dirty mass air fuel (MAF) sensor
- Dirty or "oiled" air filter
- Faulty fuel regulators or injectors
- Vacuum leak
- Worn-out spark plugs
- Faulty oxygen sensor
- Faulty coolant system or thermostat
Severity - moderate
Does not have immediate danger effect to the car or driver, but at longer period could lead to engine overheating and possible damage. Increasing environment pollution.
Troubleshooting
- Check and clean MAF and oxygen sensors
- Inspect vacuum and fuel pipes
- Inspect and replace, if required, air filter
- Inspect and replace, if required, fuel pressure regulators or pump
- Inspect and replace, if required, coolant sensors or thermostat
- Inspect and replace, if required, spark plugs
