BMW Replace Key Service If you have a BMW key that has stopped working, it may simply require that its battery replaced. You can easily do this yourself. You can buy a replacement keyfob online through an reputable seller. However, you'll require the key fob programmed by the locksmith or https://autolocksmiths04400.jts-blog.com/29970634/5-bmw-1-series-key-lessons-from-professionals