Azs63

I have a 2008 s63 with 91k getting a loud whining noise when I turn the steering wheel in either direction don't see any leaks and fluid level is full also getting a message "park assist currently unavailable see oper. Manual " any help would be great

S65 Arabia

Have you had it "scanned" by a garage? I use my service garage (not Mercedes benz) as they are cheap. They have a scanning tool which will pull up all faults. This will identify the issue as reported by the Benz Computer. Hope this helps a little.

triniexr

It could be the steering pump or serpentine belt. These cars are still hydraulic steering not electric.

Welwynnick

First thing is check your power steering fluid level.

Second is replace the poly-V / serpentine / auxillary drive belt.

Third change the power steering pump.

Nick