Replace BMW Key Battery It's probably time to change your battery if your BMW key won't open your car or turn off the engine. Fortunately, it's an easy fix. It's as easy as removing the key fob, then replace the battery, and then gently put it back. Follow these steps https://thekeylabcouk22599.targetblogs.com/30632130/why-bmw-key-fobs-may-be-more-risky-than-you-think