Replace BMW Key Battery It might be the time to change your battery in the event that 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 key fob cover, carefully remove and replace the battery, https://carkeyreprogramming09352.total-blog.com/how-to-create-an-awesome-instagram-video-about-bmw-3-series-key-fob-55419250