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How to Repair a Remote Key Although most remote key fobs have amazing battery lifespan, they eventually wear out. Some times it is as simple as changing the batteries inside the device, but in other cases the problem can be more severe. Take apart the remote and clean the buttons. Then move them out and in. These steps could be all you need to get the key fob to work. Battery Car key remotes use CR2025 or CR2032 batteries, and they can often be swapped out if the fob is still functi