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Car Remote Key Repair Modern car remotes are convenient and useful however, they can be a pain when they stop working. There are a few easy fixes to make them work again. Replace the battery first. The majority of fobs are powered with lithium coin cells. These are cheap and easy to locate. Broken Electronics The electronic circuit board that is in the remote car key transmits and interprets signals for your vehicle. If the board is damaged, the key fob will not perform as it should. Unlike battery failure, which is usually very simple for most drivers to repair