Well, I have had p0400 issues. Go figure... Replaced the EGR valve today, as the pindle wasn't moving. Cleared the code, went through a few drive cycles and Bam, cel is back on. Wanted to clean the tube out, but I couldn't get it out of my engine! Any tricks to getting it out? My c240 wagon had no space to work with, but I'd like to avoid the $350 shop charge if I can. Thanks guys.