Long-term fuel trim on Bank 1 exceeded the lean threshold; the DME is adding maximum fuel to compensate.
SYMPTOMS
- Check-engine light
- Rough idle
- Hesitation
- Slight power loss
LIKELY CAUSES
- Vacuum/intake leak
- Dirty or failing MAF
- Low fuel pressure
- Weak fuel pump
- Dirty injectors
DIAGNOSIS STEPS
- Read fuel trims
- Smoke-test the intake
- Check MAF reading vs expected
- Verify fuel pressure
RELATED PARTS
- MAF sensor
- Intake gaskets/boots
- Fuel pump