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Car Remote Key Repair Modern remotes for cars are useful and convenient, but they can be a hassle when they stop working. There are a few quick fixes to make them work again. Replace the battery first. The majority of fobs are powered by lithium coin cells. They are inexpensive and easy to locate. Broken Electronics The electronic circuit board inside your remote car key transmits and interprets signals to your vehicle. The key fob won't function if this board is damaged. Damage to the receiver or transmitter will require an auto-locksmith pro