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Cost to Replace Car Key Fobs It can be expensive to replace a key fob that has been damaged or lost. Many factors affect the cost. Key fobs transmit radio signals that trigger the car's onboard computer to unlock doors or start the engine. You may need go to the dealer to repair and programme it, depending on the model. Replacement Fobs Car fobs have evolved from basic keys made of metal to sophisticated convenience and security devices. They are not impervious to destruction and can be expensive to replace if they get damaged or lost.