Replace BMW Key Battery It could be time to change your battery if your BMW key won't open your car or turn on the engine. It's a simple fix. All you have to do is remove the cover for the key fob then carefully remove and replace the battery, and https://carkeyreprogramming55723.full-design.com/bmw-key-fobs-the-ultimate-guide-to-bmw-key-fobs-72758678