P2271 MERCURY - Oxygen Sensor Signal Stuck Rich Bank 1 Sensor 2
When is the code detected?The Powertrain Control Module (PCM) detected the HO2S12 sensor has reported a rich condition for an extended period during an intrusive test
P2271 Mercury DescriptionThe downstream heated oxygen sensor (HO2S) is forced rich and lean and monitored by the Powertrain Control Module (PCM). The test fails if the PCM does not detect the output of the HO2S in a calibrated amount of time.
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