Why Buy a Genuine BMW Replacement Key? BMW key fobs were designed with security in the forefront. They only transmit a unique identifying signal to your vehicle. This prevents unauthorized third parties from gaining access to your vehicle or cloning the key. BMWs do not accept keys from used cars. https://carkeyprogramming92155.blog-kids.com/30397422/three-reasons-to-identify-why-your-bmw-car-key-isn-t-working-and-the-best-ways-to-fix-it