Most times when you get this diagnosis the best way to resolve it is to replace the o2 sensor, because it is faulty. Many of your newer cars have more than one so knowing which one is helpful.... anytime you see bank 1 it means in front of the catalytic converter, if you see bank 2 then it means it is behind the catalytic converter, basically bank 1 sensor 1 is going to be closest to the header/manifold. bank 2 sensor 2 will be back towards the muffler/tailpipe
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