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P2271 Diagnostic Trouble Code Discussion for April 2021

Heated Oxygen Sensor (Bank 1 Sensor 2) Signal Biased Rich

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Trouble Ticket Help Requests for DTC P2271
Help Request Posted
2012 GMC Yukon XL 1500 Denali 6.2L MIL Lamp on VIN: 1GKS2MEF3C
P2271: Signal stuck rich B1S2. ... later after replacing B1S2 it has set P013A and P2271 for the same sensor. Don't see a significant difference between the post cat sensors. There is some difference between the precat sensors but both of them seem to...
April 12, 2021