P0175 – System Too Rich (Bank 2)
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Symptoms
- Black smoke
- Poor fuel economy
- Rough idle
- Fuel smell
- Check engine light
Causes
- Leaking injector (Bank 2)
- High fuel pressure
- Faulty MAF sensor
- Stuck open purge valve
- O2/AFR sensor bias
Diagnosis
- Check fuel trims
- Inspect Bank 2 injectors
- Measure fuel pressure
- Test purge valve
- Check MAF readings
Repair
- Replace leaking injector
- Repair fuel pressure regulator
- Replace MAF sensor
- Fix purge valve issues