Replace BMW Key Battery It's probably time to replace your battery if your BMW key won't allow you to open your car or turn the engine. It's an easy fix. It's as easy as removing the key fob, then replace the battery and gently put it back. Follow these steps https://carkeyreplacements27766.collectblogs.com/75558726/what-s-everyone-talking-about-bmw-key-fobs-right-now