What this code means

The PCM has detected that the long-term fuel trim is correcting excessively in the rich direction, indicating the engine is running too lean. The fuel system is consistently delivering less fuel than needed.

Symptoms

• Check Engine Light
• Rough idle
• Hesitation on acceleration
• Poor performance
• Possible misfires

Common causes

• Vacuum leak in intake system
• Low fuel pressure (weak pump or clogged filter)
• Dirty or failing MAF sensor
• Exhaust leak before O2 sensor
• Clogged fuel injectors

Diagnostic steps

1. Check long-term fuel trim values (excessively positive indicates lean correction)
2. Perform smoke test for vacuum leaks
3. Check fuel pressure under load
4. Clean or test MAF sensor
5. Check for exhaust leaks

Repair notes

Repair vacuum leaks or fuel delivery issues causing the lean condition.

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