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Car Fob Replacement Key If your key fob stops working, it is vital to get it replaced immediately. A key fob that is not working can make it difficult to start your car or unlock it. Fobs are typically powered by a flat batteries that can be easily replaced at your local big-box retailer or at a hardware store. Modern fobs contain a transponder, which must be reprogrammed to function properly. This requires specialized equipment, which is generally only available from dealerships. C