Replace BMW Key Battery It's probably the time to change your battery if your BMW key isn't able to open your car or turn the engine. It's an easy fix. You simply need to remove the key fob, then replace the battery and gently place it back. Follow these steps https://car-key-repairs76562.ka-blogs.com/83478945/14-questions-you-shouldn-t-be-insecure-to-ask-about-bmw-3-series-key-fob