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Car Remote Key Repair Modern car remote keys are useful and convenient, however they can be a hassle when they stop working. There are a few easy fixes to get them working again. Replace the battery first. The majority of fobs utilize lithium coin cells, which are affordable and easy to find. Broken Electronics The electronic circuit board that is in your car key remote transmits and interprets signals for your vehicle. The key fob won't function when the board is damaged. Damage to the receiver or transmitter will require an auto-locksmith who is a professional