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How to Repair a Remote Key While most remote key fobs have impressive battery lives they will eventually wear out. Sometimes it's as simple as replacing the batteries, however sometimes there are more serious problems. Take the remote apart and clean the buttons. Then move them in and out. These techniques might be all you need to get your key fob working. Battery Car key remotes use CR2025 or CR2032 batteries and they can be replaced in the event that the device is functional. If not, inspect the