DTB P-B-46.40/53 JAN07 (all 211 & 219 models) Cracking/creaking noises from steering rack area when steering vehicle at low speeds or the vehicle is stationary this may be due to contact between the steering mounting plate and the subframe. To remedy washers will be installed between steering mounting plate and subframe. The two nuts must also be replaced.

 

Here is the link, I think I have this problem..

http://www.alldata.com/tsb/Mercedes-...3/4640531.html