Replace BMW Key Battery It's probably the time to change your battery if your BMW key won't allow you to open your car or turn the engine. It's a simple fix. It's as easy as removing the key fob, replace the battery and gently place it back. Follow these steps https://thekeylab05326.bloggazzo.com/29609944/the-time-has-come-to-expand-your-bmw-key-fobs-options