WARNING: This page is about a different car, the 2005 BMW 745i, 2004 BMW 745i, 2003 BMW 745i, and 2002 BMW 745i. However, it is still accessible from the selected car via links, so may be relevant.
Steering wheel:
Move steering wheel back and forth and check for zero clearance.
Tie rod joint:
There must no clearance between tie rod arm (2) and tie rod joint (1).