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Remote Key Fob Repairs You Can Do at Home If your remote key fob stops working, you may be tempted to go to an establishment to have it changed. Instead, try some quick fixes at home. Begin by replacing the battery. Hardware stores carry flat watch-style batteries that are affordable and easy to find. You can then take a look at the key fob and look for buttons that are worn out or out of the right place. Dead Battery The key fob, a tiny electronic device, allows you to lock and unlock your vehicle.