P1177moderate severityPowertrain
Mixture Adaptation Bank 2 Limit Reached
on 2011 Audi Q7 3.0L Supercharged V6 · AWD
What this code means
The ECU detected that the mixture adaptation for Bank 2 has reached its maximum or minimum correction limit. This is the Bank 2 equivalent of P1176.
Symptoms
- Check Engine Light
- Rough idle
- Poor fuel economy
- Hesitation under load
Common causes
- Vacuum leak at Bank 2
- MAF sensor fault
- Fuel injector issue Bank 2
- Fuel pressure regulator fault
- Exhaust leak Bank 2
Diagnostic steps
- Reset adaptations and monitor
- Smoke test focusing on Bank 2
- Compare fuel trims between banks
- Test fuel pressure
- Check for exhaust leaks Bank 2
Repair notes
Repair the root cause of adaptation limit on Bank 2.
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