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P0175 System Too Rich (Bank 2)
What it means
Bank 2 is running rich — too much fuel versus air.
Severity: Moderate
Can I drive it? Short-term OK; fix soon to protect plugs and the converter.
Common causes (most likely first)
- Faulty MAF sensor
- Leaking injectors
- High fuel pressure
- Faulty bank 2 upstream O2 sensor
- Clogged air filter
Likely fixes
- Replace air filter
- Clean/test MAF
- Test fuel pressure
- Test bank 2 O2 sensor and injectors
DIY parts cost
$15–$300
Approximate estimate
Shop repair cost
$100–$900
Approximate estimate, parts + labor
DIY difficulty
Moderate
Varies by vehicle
Cost ranges are rough, approximate U.S. estimates and vary widely by vehicle, region, and parts brand. Always confirm the diagnosis before buying parts.
Parts you may need
- Engine air filterCheck price
- MAF sensor cleanerCheck price
- Upstream oxygen sensorCheck price
- Fuel injectorCheck price
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