Replace BMW Key Battery It's probably time to change your battery if your BMW key won't open your car or turn off the engine. Fortunately, it's an easy fix. All you need to do is take off the key fob cover then carefully remove and replace the battery, and then https://www-thekeylab-co-uk95437.blogminds.com/three-reasons-why-3-reasons-why-your-bmw-3-series-key-fob-is-broken-and-how-to-fix-it-27810506