Getting a BMW Spare Key The BMW's key fob might need an upgrade in battery. It is possible to upgrade to smart keys that use your smartphone as a replacement for a key. BMW must prepare replacement fobs to your vehicle using its VIN. This is done to ensure security. https://carkeyreplacement31461.win-blog.com/10140695/why-is-bmw-key-1-series-so-effective-during-covid-19