Replace BMW Key Battery If your BMW key isn't opening your car or turning on the engine, it may be the time to replace your battery. Fortunately, it's a simple fix. It's as easy as removing the key fob, then replace the battery, and then gently put it back. Follow https://thekeylab05326.bloggazzo.com/29519442/10-bmw-key-fobs-tricks-all-experts-recommend