Getting a BMW Spare Key The BMW's key fob could need a new battery. You might want to upgrade to smart keys, which utilize your smartphone as a replacement for a key. BMW must create replacement fobs for your car using the VIN. This is done to protect your vehicle. https://carkeyrepairs14667.blog-a-story.com/10206050/bmw-key-1-series-101-the-ultimate-guide-for-beginners