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

1. Compare fuel trims Bank 1 vs Bank 2
2. Test O2 sensor Bank 2
3. Check fuel pressure
4. Inspect PCV system
5. Test coolant temperature sensor

Repair notes

Repair the cause of excess fuel delivery on Bank 2.

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