The dealer also told us that the compressor for the rear suspension system is worn out and does not make compression. They wanted over $800 to repair it. Since that fault does not cause it to go into limp mode we decided to repair that after we got back home. The run from Las Vegas to Southern Idaho went well, 510 miles averaging 71 mph.

Where is that compressor located? Maybe I can swap it out.

__________________
.
1st MBz: 1982 300SD
2nd MBz: 1987 300SDL
3rd MBz: 1995 S420
4th MBz: 1987 190DT
5th MBz: 1984 300SD w/1983 300DT engine
6th MBz: 1999 C230k I'm 3rd owner, got it w/57,235 miles.
and manages Mom's 2007 R320 CDI