OBD
P2097
Post Catalyst Fuel Trim System Too Rich (Bank 1)
What it means
P2097 means Post Catalyst Fuel Trim System Too Rich (Bank 1).
Check these first
- Failed downstream oxygen sensor
- Faulty catalyst condition
- Fuel pressure or injector fault
- Engine running rich from other causes
What to do next
- Inspect for fuel contamination and check fuel pressure
- Watch downstream sensor voltage and fuel trims
- Verify catalyst behavior at steady state
- Test the downstream sensor's response
- Fix the richness source and run a catalyst monitor
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.