P2271 - O2 Sensor Signal Stuck Rich - Bank 1, Sensor 2 - DTC Chart

P2271 - O2 SENSOR SIGNAL STUCK RICH - BANK 1, SENSOR 2 - DTC CHART

Description: The heated oxygen sensor bank 1, sensor 2 (HO2S12) is forced rich and lean and monitored by the PCM. This DTC sets when the PCM does not detect the output of the HO2S in a calibrated amount of time.
Possible Causes: Pinched, shorted, and corroded wiring and pins Crossed HO2S12 wires Exhaust leaks Contaminated HO2S12 Damaged HO2S12
Diagnostic Aids:
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to Pinpoint Test H .