MMM, my original key must still be registered on the ECU because I can still open and lock the car, it just the immobilizer part that's not working, I know there is a chip on the inside of the key fob, and that is what seems to be the problem, I don't know how this is programmed in the first place, its just very strange how after the cars battery went flat, the immobilizer chip could not be read by the ECU after a car battery replacement.
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