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How to Repair a Remote Key Although most remote key fobs have excellent battery life, they'll eventually get worn out. Some times it is simple to replace the batteries in the device but sometimes the issue could be more severe. Take the remote apart and clean the buttons. Then move them in and out. These techniques may be all that you require to get your key fob back in working order. Battery Car key remotes utilize CR2025 or CR2032 batteries and they can be replaced if the fob is still operational. If it's not then you can remove the fob and inspect the batteries