Code result
P2097
Post Catalyst Fuel Trim System Too Rich
Moderate severity
What it means
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?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Catalyst oxygen storage exhausted
highOne of the most commonly reported causes for this code — check this first.
Downstream sensor biased rich
mediumA plausible cause — test and verify before replacing parts.
Related help
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