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you can undo batterys, and don't forget once you turn your key on the first time dont start but put in on position and slowly put pedal to floor and let it come up slowly and this resets the apps
you won't always get a CEL but usually the code is still stored so if you put a code reader on it you would more than likely see a code, most commonly P0121.
there is a way to bypass i just did mine,and it works great,you take the ecm out of the loop,i have step by step instructions,from ats pm me if you are interested