Powertrain, generic (extended)

P2275 O2 Sensor Signal Biased/Stuck Rich (Bank 1, Sensor 3)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Third oxygen sensor contaminated or damaged by water
Signal wire of sensor 3 touching a voltage source

Symptoms

  • Malfunction indicator lamp on
  • No noticeable change in driveability

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–300
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

oxygen sensor downstreamoxygen sensor wiring

Related codes

P2274P2277P2271P0142P0144P0420

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.