Replace BMW Key Battery It could be time to replace your battery in the event that your BMW key won't open your car or turn off the engine. Fortunately, it's an easy fix. Simply remove the key fob, then replace the battery and gently place it back. Follow these steps https://carkeyrepair02630.blogsumer.com/29727014/why-bmw-key-fobs-is-your-next-big-obsession