Getting a BMW Spare Key The BMW's key fob might require a new battery. You may want to upgrade to smart keys that use your smartphone as a replacement for the key. BMW will prepare replacement fobs for your vehicle by using its VIN. This is done to ensure security. https://car-key-repairs81453.dailyhitblog.com/35598535/the-reasons-why-bmw-key-1-series-has-become-the-obsession-of-everyone-in-2023