Replace BMW Key Battery If your BMW key isn't opening the doors of your vehicle or turning the engine, it might be the time to replace your battery. It's a simple fix. All you have to do is remove the key fob cover then carefully remove and replace the battery, https://thekeylab34492.blogsvila.com/30286902/20-best-tweets-of-all-time-bmw-3-series-key-fob