Causes and Fixes P2271 Code: O2 Sensor Signal Biased / Stuck Rich Bank 1 Sensor 2

How to fix P2271 Code: O2 Sensor Signal Biased / Stuck Rich Bank 1 Sensor 2 A P2271 code is set when the Bank-1 Sensor-2 oxygen sensor reports a Rich air-fuel mixture. A Rich condition exists if the engine is getting more fuel than air in the cylinders. (Air/Fuel Ratio is wrong) P2271 code can sometimes be problematic since it can be caused by many things. Causes of a P2271 code include a bad oxygen sensor, oxygen wiring issues, or Rich condition such as wrong fuel pressure or bad injector. Possible Causes of a P2271 Code: Bad Oxygen Sensor Oxygen Sensor Wiring (Open Short) Rich Running Condition (injector, purge valve, fuel pressure) By using this information user assumes all risk of use.