Replace BMW Key Battery If your BMW key isn't opening your car or turning over the engine, it could be time to change your battery. Fortunately, it's an easy fix. It's as easy as removing the key fob, then replace the battery and gently place it back. Follow these steps https://car-key-reprogramming30394.blogdiloz.com/29464247/5-bmw-key-fobs-lessons-learned-from-the-professionals