P0175high severityPowertrain
System Too Rich Bank 2
on 2012 Audi A6 3.0L Supercharged V6 · AWD
What this code means
The long-term fuel trim for Bank 2 has exceeded the negative limit, indicating rich running on Bank 2.
Symptoms
- Check Engine Light
- Black smoke
- Poor fuel economy
- Rich exhaust smell
Common causes
- Leaking injector Bank 2
- High fuel pressure
- Faulty O2 sensor Bank 2
- EVAP issue
Diagnostic steps
- Check fuel trim Bank 2
- Test injectors Bank 2
- Test fuel pressure
- Check O2 sensor Bank 2
Repair notes
Same diagnostic approach as P0172 but focused on Bank 2.
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