How to Replace a Dead BMW Key Fob Nearly every BMW owner will need to replace their key fob's battery at some point in time. It's a simple task that will not cost a fortune. The key fob runs on the standard CR2032 battery and can easily be repaired at https://autolocksmith03210.bloggadores.com/30162431/what-freud-can-teach-us-about-bmw-car-key-replacement