Replace BMW Key Battery If your BMW key isn't able to open your car or turning over the engine, it may be the time to replace your battery. It's a simple fix. Simply remove the key fob, replace the battery, and then gently put it back. Follow these steps to https://carkeyreplacement09721.bligblogging.com/30665154/why-bmw-key-fobs-should-be-your-next-big-obsession