Replace BMW Key Battery It's probably the time to change your battery if your BMW key won't open your car or turn off the engine. Fortunately, it's an easy fix. All you need to do is take off the key fob cover take it off, then replace the battery, and https://car-key-replacement61857.jts-blog.com/29472442/is-bmw-key-fobs-really-as-vital-as-everyone-says