Replace BMW Key Battery It's probably time to replace your battery If your BMW key won't open your car or turn on the engine. It's a simple fix. All you need to do is remove the cover of the key fob then carefully remove and replace the battery, and insert https://car-key-repair61479.wizzardsblog.com/30152378/20-best-tweets-of-all-time-about-bmw-3-series-key-fob