Replace BMW Key Battery It could be the time to change your battery if your BMW key isn't able to open your car or turn on the engine. It's a simple fix. It's as easy as removing the key fob, replace the battery, and then gently put it back. Follow https://car-key-reprogramming63801.dgbloggers.com/30499404/the-best-bmw-key-fobs-methods-to-change-your-life