OBD-II code · Powertrain (generic, extended)
P2097 Post Catalyst Fuel Trim System Too Rich (Bank 1)
Long-term post-catalyst fuel trim on bank 1 has reached its rich limit. The downstream sensor sees more reductant than expected, often pointing to a degraded catalyst that no longer stores oxygen, or a failing downstream sensor biased rich.
Is it safe to drive with P2097?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyCatalyst oxygen storage exhausted
- PossibleDownstream sensor biased rich
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–4 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oxygen Sensor Downstream, Catalytic Converter
Related codes
- P2096Post Catalyst Fuel Trim System Too Lean (Bank 1)
- P2099Post Catalyst Fuel Trim System Too Rich (Bank 2)
- P2094B Camshaft Position Actuator Control Circuit Low (Bank 2)
- P2095B Camshaft Position Actuator Control Circuit High (Bank 2)
- P2098Post Catalyst Fuel Trim System Too Lean (Bank 2)
- P209AReductant Injection Air Pressure Sensor B Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.