Bruce Nunnally Posted July 10, 2022 Report Share Posted July 10, 2022 Got a DTC P2271 at around 52K miles. Ordered 4 new sensors from Rockauto.com, which will take a few days to arrive. Bank 1 sensor 2 is the downstream, post-cat sensor on the passenger side. It measures the exhaust after the cat. Although just that one is showing I wanted to have all of the sensors on hand to replace together or as needed depending on how hard they resist. Quote Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
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