Getting a BMW Spare Key The BMW's key fob could require a new battery. You might want to upgrade to smart keys, which use your smartphone as a substitute for a key. BMW must create replacement fobs for your vehicle with its VIN. This is done to protect your vehicle. https://carkeyreprogramming51413.mdkblog.com/35816867/5-bmw-key-1-series-projects-for-any-budget