Replace BMW Key Battery It's probably time to replace your battery in the event that your BMW key won't allow you to open your car or turn off the engine. It's simple to fix. It's as easy as removing the key fob, replace the battery and gently put it back. https://carkeyreprogramming71428.dsiblogger.com/62965701/15-bmw-key-fobs-benefits-that-everyone-should-know