Getting a BMW Spare Key The BMW's key fob might need a new battery. Or perhaps you want to upgrade to a smart key, which replaces your smartphone with a compatible key. To protect yourself, replacement fobs must be purchased from BMW and designed specifically for your vehicle based on https://car-key-reprogramming77131.blogunteer.com/29466623/why-everyone-is-talking-about-bmw-key-1-series-right-now