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Car Fob Replacement Key When your key fob stops working, it is important to get it replaced as soon as you can. A malfunctioning fob could make it impossible to start or even unlock your vehicle. Typically, fobs use flat batteries that are simple to replace at your local hardware store or big-box retailer. Modern fobs come with a transponder that needs to be programmed in order to function correctly. This requires specialized equipment, which is typically only available at dealerships. Cost