I performed this service on Friday following Sunedog's post as well as with a lot of help from the PDF files from kwmccauley.

When I finished my EGR tube was whislte-clean, but I continue to get the P400 code! I was told by a Benz-mechanic that after he cleaned the tube if the Check Engine light came on again I would need to replace the EGR valve to solve the problem. Before I go there myself, is there anymore advice? Thanks in advance!

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1999 ML430
2003 Chevy Suburban Z71
1993 Honda Prelude V-Tech