Idle controller inoperative as determined by this page -

http://pages.prodigy.net/jforgione/MB_S500.html

In this website -

http://pages.prodigy.net/jforgione/MB_DM.html

I know of someone who got that code, erased it and hasn't had it come back.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD