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Originally Posted by DR-JEKL
It's good practice to change the O2 sensors in pairs so that both banks are 'in sync'.
Why do you think one sensor is still OK but one isn't (fault codes leading to one particular bank/sensor?)
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I know I wanted to do both but funds won't let me for now. It was either buy both o2 sensors and no fuel sensor or buy the one I know isn't good and the fuel sensor which is giving me codes.
I had it scanned and it came up as bank 1 pre cat