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Remote Key Fob Repairs You Can Do at Home If your remote key fob stops functioning, you might be tempted to go to an authorized dealer to get it reprogrammed. Try some quick fixes in your home. Begin by replacing the battery. Hardware stores sell flat watch-style batteries that are affordable and easy to locate. Look over the key fob to find worn buttons or ones that are out of the right place. Dead Battery The key fob is an electronic device that allows you to lock or unlock your vehicle.