Replace BMW Key Battery If your BMW key isn't opening your car or turning over the engine, it might be time to replace your battery. Fortunately, it's a simple fix. All you need to do is remove the cover of the key fob then carefully remove and replace the battery, https://thekeylab81881.izrablog.com/30703383/15-reasons-why-you-shouldn-t-be-ignoring-bmw-3-series-key-fob