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Car Alarm Key Fob Replacement If they stop working, today's complex keyfobs can cost hundreds of dollars. This includes the cost of a replacement fob, and getting it reprogrammed to ensure that it works with your car. Aftermarket key fobs are cheaper but they may not have the security features that are standard on OEM keys. Certain aftermarket key fobs could even disable the vehicle's antitheft system. Reduced operational range The control module (the brain of the system) and the key fobs and the