P2275: O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 3
What to do
The car will drive normally. Ask for the wiring underneath the vehicle to be checked before the sensor is replaced, and treat any converter diagnosis made alongside this as unproven.
What this code means
The stuck-rich condition at the third sensor position on bank 1. The reasoning is at P2271 and the exposure of the harness at this position is at P2274.
Likely causes
Start here
- Faulty oxygen sensor · moderate
- Damaged wiring harness · moderate
- Contaminated oxygen sensor element · moderate
Less common
- Water ingress into connector · easy
- Excessive oil or coolant consumption · specialist
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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