Buy OEM Audi Part # 8K0407253AA (8K0-407-253-AA, 8K0407253S). Steering Knuckle. 2013-2016, KSM. A4, S4; Left; KSM. A5, S5; Left. Allroad; Left; KSM. From 11/01/2009, KSM. FROM 11/2009, KSM. KSM, code

Housing. Steering knuckle.
A knuckle used on a Steering axle that has no additional components attached. Part has related components that cannot be reused/reinstalled; upper bolt, lower bolt and locknut. Stamped #KSM.

Steering Knuckle

Fits A4, A5, allroad, Q5, RS5, S4, S5

2013-2016, KSM. A4, S4; Left; KSM. A5, S5; Left. Allroad; Left; KSM. From 11/01/2009, KSM. FROM 11/2009, KSM. KSM, code GP1. Q5; Left. Q5; Left; KSM.
Steering Knuckle - Repair or Replace
The steering knuckle in your Audi may need to be replaced if it has become damaged or rusty, which will usually be determined during a related repair.