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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Well, it would have been nice if GM would have paid for it. But, it was just a software update, and was not a safety issue/recall.
