BMW Key Fob Replacement Cost BMW dealerships charge from $400 and $650 for new car key fob. You can save money by purchasing a BMW keyfob online and having it programmed at home. Most BMW fobs are re-usable. You can purchase an additional battery from a hardware or big-box retailer. https://wwwthekeylabcouk89079.suomiblog.com/5-bmw-key-fob-replacement-projects-for-any-budget-45868488