WARNING: This page is about a different car, the 2006 BMW 330xi, 2006 BMW 330i, 2006 BMW 325xi, 2006 BMW 325i, and 2006 BMW 323i. However, it is still accessible from the selected car via links, so may be relevant.
TORQUE SPECIFICATIONS - ELECTRONIC POWER STEERING
Type
Thread
Tightening specification
Measure
1AZ Retaining plate, active front steering control unit to body