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How to Repair a Remote Key Although many remote key fobs have amazing battery lifespan, they eventually wear out. Sometimes it's as simple as changing the batteries, but occasionally there are more serious issues. One quick fix that may aid is to disassemble the remote by cleaning the buttons and flexing them in and out. These steps could be all that you need to get your key fob back in working order. Battery If the fob is still working it is possible to swap out the CR2025 or CR2032 battery. If not, you can look at the battery terminals and buttons to determine