Post Catalyst Fuel Trim System Too Lean (Bank 2)
Bank 2 counterpart of P2096. The post-catalyst fuel trim correction on bank 2 has reached its lean limit, suggesting an exhaust leak after the bank 2 catalyst, a drifting downstream sensor, or a degraded catalyst.
Affected components
- Oxygen sensor downstream
- Catalytic converter
Common causes
- High likelihood: Exhaust leak after bank 2 catalyst
- Medium likelihood: Bank 2 downstream sensor drifting
Possible symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
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.