. . . if you have an OBD type scanner
you can read and get a more detailed definition of what that DTC (Diagnostic Trouble Code) means.
The OBD (On Board Diagnostics) with the newer MBs (96 and on) have gone to this system. I assume that you read this on a bill from your shop as a 'teaser' to what's wrong with your car.
Need to get an OBD compliant scanner. This site offers one (Ottoscan) that is used in conjunction with your PDA. There are many others available as a standalone in the range of $200 - $500.
Check my page (red house) to see what some of the DTCs are for the S class car broken down by system auto function.
Regards . . . . JimF
'94 S500 Cpe
Visit my Mercedes Web Page