1990 Oldsmobile Regency "reprogram space key" Questions

...key fobs no longer worked, so I replaced the batteries. However, they still would not operate. Following the suggestions I found for similar 1990 Olds models, I've tried the following to re-program ...

...key that is not programed to this vehicle the antitheft will kick in and you might have to have get your vehicle scanned and the keys reprogramed.you could try disconnecting the battery for at least ...