The post-cat oxygen sensor is stuck reading rich. It could be the sensor, or the engine genuinely could be running rich.
P2271 — also written P2271, P 2271, 2271 — is the OBD-II code for o2 sensor signal stuck rich (bank 1, sensor 2). Same code, same fix: this page covers every spelling of it.
P2271 is a emissions fault code, typically costing £90–£400 to put right in a UK garage.
What causes P2271?
- Failed rear O2 sensor
- Genuinely rich mixture from a leaking injector
- Contaminated sensor from oil or coolant burning
- Short to voltage in the signal wire
How P2271 is fixed
- Check fuel trims before replacing the sensor
- Replace the rear O2 sensor
- Investigate any injector leak or oil consumption
P2271 repair cost in the UK
Most P2271 repairs land between £90–£400 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P2271?
Yes, but a rich mixture wrecks catalytic converters over time.
Urgency: medium.