Checking play

WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.

For hydraulically assisted steering systems, the engine must be running.
For electrically assisted steering systems, the ignition must be switched on.
Steering wheel:
Move steering wheel back and forth and check for play.
Tie rod joint:
There must be no play between tie rod joint (1) and steering arm (2).

Fig 1: Identifying Tie Rod Joint And Steering Arm
Courtesy of BMW OF NORTH AMERICA, INC.