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 substitutes your compatible smartphone as a key. BMW must prepare replacement fobs for your vehicle by using its VIN. This is done to ensure security. https://carkeyrepair46488.blogdon.net/bmw-key-1-series-101-the-ultimate-guide-for-beginners-46388363