WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, 2001 BMW X5, and 2000 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
Switch off ignition.
Remove ignition coils.
Detach ignition coil (1) from spark plug connector (2).
Fig 1: Detaching Ignition Coil From Spark Plug Connector