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How to Repair a Remote Key While most remote key fobs are equipped with excellent battery life, they will eventually wear out. Sometimes it's as easy as changing the batteries, but sometimes there are more serious problems. One quick fix that may aid is to disassemble the remote by cleaning the buttons and flexing them in and out. These methods could be all you need to get the key fob to work. Battery Car key remotes utilize CR2025 or CR2032 batteries and they can be replaced in the event that the device is functioning. If not, look at the bat