Replace BMW Key Battery It's probably time to replace your battery in the event that your BMW key won't open your car or turn the engine. Fortunately, it's a simple fix. You simply need to remove the key fob, then replace the battery and gently put it back. Follow these https://car-key-replacements27817.blogdomago.com/29464708/the-complete-list-of-bmw-key-fobs-dos-and-don-ts