Is a reflash of the ECM necessary
I have gotten a Check engine light a couple of times, and then soon after it goes off. I hae a mechanic pull the codes and it is saying that Back 1 and 2 O2 sensors are staring to fail. He suggested...
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You shouldn't have to flash the PCM after replacing the sensors, the only reason I can think of would be to erase the codes, but they will go away on their own anyway. I would go ahead and DIY the sensors, and if the light comes on again take it in to the mechanic for a re-scan.
