Post Catalyst Fuel Trim System Too Rich (Bank 2)
Bank 2 counterpart of P2097. Post-catalyst trim on bank 2 has reached the rich limit — usually a depleted catalyst or a downstream sensor biased rich on the bank 2 side.
Affected components
- Oxygen sensor downstream
- Catalytic converter
Common causes
- High likelihood: Bank 2 catalyst oxygen storage exhausted
- Medium likelihood: Bank 2 downstream sensor biased rich
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.