Replace BMW Key Battery If your BMW key isn't opening your car or turning over the engine, it could be time to replace your battery. It's simple to fix. All you have to do is take off the key fob cover then carefully remove and replace the battery, and then https://car-key-programming49672.daneblogger.com/29602755/15-reasons-you-shouldn-t-ignore-bmw-3-series-key-fob