Fuel Trim Malfunction Bank 2
Fuel trims on bank 2 exceed adaptation limits in either lean or rich direction. The ECU cannot maintain stoichiometric mixture within calibrated boundaries.
Affected components
- Oxygen sensor
- Mass air flow sensor
- Fuel injector
- Intake manifold
Common causes
- High likelihood: Oxygen sensor bank 2 aged
- Medium likelihood: Vacuum leak bank 2 side
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
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.