Getting a BMW Spare Key You might need to replace the battery in your BMW key fob. Or perhaps you want to upgrade to a smart key, which substitutes your smartphone that is compatible with it as a key. BMW must create replacement fobs to your vehicle with its VIN. https://thekeylab-co-uk64427.bloguerosa.com/29453622/how-do-you-know-if-you-re-set-for-bmw-key-1-series