Hey everyone, I'm back! I'm having an issue with my crank sensor on my 04' Colorado. It keeps seeting off my check engine light. The computer says the crank sensor needs to be relearned?? They relearn it and it only takes a few weeks and it's back again. I was going to put a new crank sensor in it but the dealer says they've never had one go bad so now I'm leary!:neutral: What the crap is relearning it do anyways and even though I have a lot of Electronics back ground I'm not sure where to start!!:neutral: I'm guessing it has a chip in it and it has to be programmed to match the ECM but that's a guess!!