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Car Remote Key Repair Modern car remote keys are useful and convenient, but they can be frustrating when they stop functioning. There are a few easy solutions to get them back in operation. Replace the battery first. Most fobs are powered by lithium coin cells. These are cheap and readily available. Broken Electronics The remote car key you have an electronic circuit board inside that transmits and interprets signals to your vehicle. If this board is damaged the key fob won't function properly. Damage