P2097: Post catalyst fuel trim system too rich (Bank 1)
Drive carefully. Get it checked within a week or two.
Can I drive with P2097?
Yes, but drive carefully and get it checked soon. Rear O2 sensor detects excess fuel; slightly high fuel consumption.
What does P2097 mean?
P2097 stands for Post Catalyst Fuel Trim System Too Rich (Bank 1).
Symptoms you may notice
- Drop in gas mileage by 10% to 15%
- Slight hesitation or sluggish response when accelerating
- Check engine light illuminated
How much does it cost to fix?
Repair costs for code P2097 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Faulty downstream oxygen sensor
- Leaking fuel injector on Bank 1
- High fuel rail pressure
- Degraded catalytic converter
What to do next
- Inspect spark plugs on Bank 1 for rich carbon deposits.
- Test downstream sensor voltage with scanner.
- Replace the Bank 1 Sensor 2 oxygen sensor.
Last updated: October 2026
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General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
Code P2097 means the post-catalytic fuel trim is reporting rich. Unlike P0172 which looks at upstream sensors, this code relies on long-term downstream averaging. Drive cautiously and investigate injector leakage or sensor aging.