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Replacing a Car Key Fob A replacement car key fob isn't cheap, however, you can save on the cost. It's possible to reprogram an empty fob on your own and skip the dealership, however, it's better to let an expert handle it. A fob purchased from an aftermarket vendor isn't usually advisable and you could end up running afoul of your lease restrictions. Here's how much to expect to shell out for fobs: Battery Replacement Up until recently, if you lost a car key and fob, all you had to