How to Upgrade Your BMW Key 1 Series If your BMW key fob isn't functioning correctly, it most likely requires an upgrade to the battery. They are also referred to as coin batteries that can be easily replaced in just a few steps. Each key is linked to the profile https://auto-locksmiths87456.mybjjblog.com/what-is-bmw-battery-replacement-key-and-how-to-utilize-it-43930336