P1136moderate severityPowertrain
Long Term Fuel Trim System Too Rich Bank 2
on 2005 Audi A8 4.2L V8 · AWD
What this code means
The ECU detected that the long-term fuel trim for Bank 2 has exceeded the maximum rich correction limit. The adaptive fuel system has exhausted its ability to lean out the mixture on Bank 2.
Symptoms
- Check Engine Light
- Rich exhaust from Bank 2
- Poor fuel economy
- Rough idle
- Black smoke
Common causes
- Leaking fuel injectors Bank 2
- O2 sensor Bank 2 faulty
- Fuel pressure too high
- PCV system fault
- Coolant temp sensor issue
Diagnostic steps
- Compare fuel trims Bank 1 vs Bank 2
- Test O2 sensor Bank 2
- Check fuel pressure
- Inspect PCV system
- Test coolant temperature sensor
Repair notes
Repair the cause of excess fuel delivery on Bank 2.
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