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Anybody ever deal with a recurrent 2C7E code? Whenever I plug in my rear bank 1 O2, bank 1 richens out to about 10 AFR, and the car throws an emissions control code. When I unplug it, the car runs well, but I wanted to plug it in for diag purposes for something else. The O2 is brand new, so I am unsure as to why it is still doing it.