What this code means

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

Symptoms

• Check Engine Light
• Poor fuel economy
• Black smoke from exhaust
• Rough idle
• Fouled spark plugs

Common causes

• Leaking fuel injector
• High fuel pressure (faulty regulator)
• Faulty oxygen sensor reading lean incorrectly
• Saturated charcoal canister purging fuel vapor
• Coolant temperature sensor reading cold

Diagnostic steps

1. Check long-term fuel trim values on scan tool (excessively negative indicates rich correction)
2. Check fuel pressure with gauge
3. Inspect spark plugs for rich fouling
4. Test O2 sensor operation
5. Check for leaking injectors

Repair notes

Correct the root cause of the rich condition, typically a leaking injector or faulty fuel pressure regulator.

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