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Why a Replacement Key Fob Isn't Always a Good Idea Car key fobs can be expensive to replace. Once they stop working, you have to pay the dealer to replace them. There are cheaper ways of reprogramming a new keyfob, and you can avoid the dealership. Several local stores have the tools and technology you need to save money. How to replace a Key Fob Today's car key fobs can do more than just unlock doors and start the engine; they double as a convenience device and theft deterrent.