Replace BMW Key Battery If your BMW key isn't able to open your car or turning on the engine, it could be the time to replace your battery. Fortunately, it's an easy fix. You simply need to remove the key fob, then replace the battery and gently place it back. https://www-thekeylab-co-uk99059.widblog.com/85138072/15-top-documentaries-about-bmw-key-fobs