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Discussion Starter #1
So my 2015 CLA 4matic check engine light came on with and after running a diagnostic the following codes P2237-85 O2 sensor bank 1. And I did some research if it is a DIY issue and not sure if it’s the downstream or the upstream and if I can get the part and replace it myself, and if anyone here has faced same issue any contributions whatsoever is much appreciated,
 
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