P0175 – System Too Rich (Bank 2)
Description
The ECM detects a rich air-fuel mixture on Bank 2 based on fuel trim and O2 sensor data. Use the Fuel Trims guide and OBD2 Live Data guide to identify the pattern before replacing parts.
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Compare Diagnostic ScannersSymptoms
- Black smoke
- Poor fuel economy
- Rough idle
- Fuel smell
- Fouled spark plugs
Causes
- Leaking injector on Bank 2
- High fuel pressure
- Faulty O2 sensor stuck rich
- Restricted air intake
Diagnosis
- Monitor Bank 2 fuel trims and O2 switching
- Check fuel pressure
- Inspect Bank 2 injectors for leakage
- Inspect air filter and intake path
Repair
- Repair or replace leaking Bank 2 injectors
- Correct high fuel pressure
- Replace faulty O2 sensor
- Restore proper air intake flow
