Getting a BMW Spare Key It is possible that you need to replace the battery in your BMW key fob. You might want to upgrade to smart keys that use your smartphone as a replacement for the key. BMW will prepare replacement fobs to your vehicle by using its VIN. https://carkeyreplacement64138.isblog.net/how-can-a-weekly-bmw-key-1-series-project-can-change-your-life-47284033