mini key fob programming mini cooper replacement key fob cost Key Fob Modern key fobs offer more convenience than traditional mechanical backup keys. They allow owners to lock and unlock their car and even start it by pushing the button. Mel Yu, Automotive analyst at Consumer Reports, says that these devices are prone to be damaged and need replacement. Dealerships charge between $50 and $100 for replacement fobs and to program them into your vehicle. How to replace a fob Most cars have key fobs which allow doors to be opened and even start engines. These devices are convenient however they can be costly to fix when they fail. Fortunately, the majority of key fob problems aren't major or complicated and can be resolved by simply replacing the battery. This simple task will save you from having to visit a Car Key Cutting Service repair shop or dealership. If changing the batteries doesn't work, try reprogramming remote.