P2275O2 Sensor Signal Biased/Stuck Rich (Bank 1, Sensor 3)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2275 is the rich-side fault of the third oxygen sensor on bank 1, the last one on systems with two catalysts in series: it keeps a high voltage while the exhaust should be lean. VW's 2014 data books for the CC, Passat and Tiguan check it in fuel cut-off, comparing the voltage with 0.15 V once 4500 mg of oxygen have passed, more than the 3000 mg used for sensor 2 because the extra catalyst stores oxygen first. Jaguar Land Rover includes P2275 among the bank 1 post-catalyst sensor codes of its 2014 to 2016 3.0 supercharged V6 and replaces water-damaged sensors. Fouling by oil, coolant or sealant and a signal wire touching voltage are other plausible causes. P2271 is the same fault at sensor 2; P0144 reports a voltage above the valid range rather than a stuck reading.
- What you may notice
- Malfunction indicator lamp on
- No noticeable change in driveability
- Likely causes
- LikelyThird oxygen sensor contaminated or damaged by water
- RareSignal wire of sensor 3 touching a voltage source
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.