What does the harness look like? It's not really that big of a problem really. Happens just for the first 30 seconds of driving twice a day. Once when I start the car the 1st time of the day and after I get off work. It's just annoying feeling that vibration and stiffness.

Doesn't anyone else have this problem??

 

i have this as well, only on start up for the first turning of the wheel, hard vibration but after that its fine..

 

It's either the torque sensor under the hood, or something in the rack's servo. I plan on pulling everything apart this summer and figuring out what it is. This is a common problem with the S that no one seems to be able to pinpoint.