Cylinder 4 Air-Fuel Ratio Imbalance
Cylinder 4 fuel trim deviates significantly from the bank average — a single-cylinder injector or intake fault.
Affected components
- Fuel injector
Common causes
- High likelihood: Injector clogged or leaking
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.