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Car Remote Key Repair Modern car remotes are useful and convenient however, they can be a pain if they stop functioning. There are some quick fixes to get them working again. Replace the battery first. The majority of fobs utilize lithium coin cells, which are cheap and easily accessible. Broken Electronics The remote car key you have an internal electronic circuit board that transmits and interprets signals to your car. If the board is damaged, the key fob won't funct