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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I've got a 2002 GMC and when I got a "Check Engine" light, my mechanic recommended I go get my ECM re-flashed before we start any repairs. It appears that GM issued some updates that when applied negated the need for the "check Engine". I think it had to do with the EGR valve not opening as quickly as it did when the vehicle was new. So, you may never know what might come out of a re-flash.
