How to Upgrade Your BMW Key 1 Series If your BMW key fob isn't functioning properly, it probably just requires an upgrade to the battery. Also known as coin batteries, they can be easily replaced in just a few easy steps. Each key is connected to a profile of the https://g28carkeysolutions81516.blogpixi.com/31072238/a-comprehensive-guide-to-bmw-car-key-replacement-ultimate-guide-to-bmw-car-key-replacement