P0175
System Too Rich (Bank 2)
medium
i Description
The engine is running too rich on Bank 2. If both P0172 and P0175 are present, the cause is likely common to both banks.
? Common Causes
- Dirty air filter
- Leaking fuel injector on Bank 2
- High fuel pressure
- Faulty MAF sensor
- Faulty Bank 2 O2 sensor
! Symptoms
- Check engine light
- Poor fuel economy
- Black exhaust smoke
- Spark plug fouling
# Diagnostic Steps
- Same as P0172 but focus on Bank 2
- If P0172 is also present, focus on common causes
- Check Bank 2 fuel injectors
- Test fuel pressure
⚙ Typical Fix
Same approach as P0172 — address the rich-running cause.
Parts Needed
Varies based on root cause
Estimated Cost
$50-$500
↔ Related Codes
Q Frequently Asked Questions
Yes, but running rich wastes fuel and stresses the catalyst. Fix within a week or two.
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