Replace BMW Key Battery It might be time to replace your battery in the event that 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, replace the battery and gently put it back. https://www-thekeylab-co-uk19844.ziblogs.com/30202120/15-top-documentaries-about-bmw-key-fobs