51 21 150 Blocking, If Necessary Initializing, Car Key In Immobilizer Control Module

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2008 BMW 760Li, 2008 BMW 750i, 2008 BMW 750Li, 2007 BMW 760Li, and 2007 BMW 750i. However, it is still accessible from the selected car via links, so may be relevant.