Replace BMW Key Battery If your BMW key isn't opening your car or turning on the engine, it could be the time to replace your battery. It's a simple fix. All you have to do is take off the key fob cover take it off, then replace the battery, and https://car-key-reprogramming55001.theobloggers.com/36240877/a-the-complete-guide-to-bmw-key-fobs-from-beginning-to-end