Replace BMW Key Battery It's probably time to replace your battery if your BMW key won't open your car or turn off the engine. Fortunately, it's a simple fix. Simply remove the key fob, replace the battery and gently put it back. Follow these steps to get back on the https://carkeyreprogramming39672.shotblogs.com/3-reasons-the-reasons-for-your-bmw-3-series-key-fob-is-broken-and-how-to-repair-it-44198149