Yes I have a 2001 gt, and recently I have noticed that my remote would stop working and I had to reprogram it, but My gf never did. Well after about the third time I replaced the battery in the remote, and it seemed to work fine for a day or two, well now Mine and my gf have quit working and if I program them they will work for about an hr and then stop again. Is there a back up battery in the moduel or should I just replace the whole thing. Also I have a explorer that also has a remote and Have noticed a couple times that it would unlock the mustang doors. Is it just locking us out of the mustang . Any help would be great.