Replace BMW Key Battery If your BMW key isn't opening the doors of your car or turning over the engine, it could be time to replace your battery. Fortunately, it's an easy fix. All you have to do is take off the key fob cover take it off, then replace https://carkeyreprogramming51413.mdkblog.com/35867910/5-bmw-key-fobs-lessons-from-the-pros