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How to Repair a Remote Key Although many remote key fobs have impressive battery life, they do eventually degrade. Sometimes it's as easy as changing the batteries, but occasionally there are more serious problems. that could help is taking apart the remote, cleaning the buttons and stretching them out and in. These methods could be all you need to get the key fob to work. Battery Car key remotes are powered by CR2025 or CR2032 batteries and they can be swapped out if the fob is still functioning. If it isn't then you can remove the fob