Hello, I’ve done some searching but wasn’t able to find the answer. Has anyone seen this code before? I’m getting conflicting information on whether the valve block needs to be replaced or the rear shock assembly (I’ve been told each one was the fix) I haven’t noticed any leaks so I’m leaning towards the valve block

 

The "valve Block" contains only one valve in W211
Your error points to the "reservoir valve" in your rear strut but... You surely should check the wiring first. Wiring diagram (and possibly Star) would be handy.