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change battery on 1996 Cadillac Eldorado

I need to replace my battery I was told this can cause the computer to loose its codes is this true

Asked by for the 1996 Cadillac Eldorado
Yes you will loose them if their is any ... But if you do have "hard codes " they will return so you can deal with them ... You will have a engine light on ... So not to worry :)