P0400 = EGR flow mulfunction: issues link thread
 

got it this time - egr bypass 606 turbo
http://www.peachparts.com/shopforum/diesel-discussion/168261-got-time-egr-bypass-606-turbo.html

Where do I start? Numerous problems with my 606
http://www.peachparts.com/shopforum/diesel-discussion/238673-where-do-i-start-numerous-problems-my-606-a.html

1998 E300 TD EGR Issue
http://www.peachparts.com/shopforum/diesel-discussion/118125-1998-e300-td-egr-issue.html#post842735

97 E300D Crossover/Manifold/Flaps
http://www.peachparts.com/shopforum/diesel-discussion/258494-97-e300d-crossover-manifold-flaps.html#post2264448

'99 E300td...check engine light?
http://www.peachparts.com/shopforum/diesel-discussion/289329-99-e300td-check-engine-light.html#post2598083

Can a bad MAF cause a EGR trouble code? OM 606
http://www.peachparts.com/shopforum/diesel-discussion/236377-can-bad-maf-cause-egr-trouble-code-om-606-a.html#post2003849

97 e300 EGR code / limp mode
http://www.peachparts.com/shopforum/diesel-discussion/269679-97-e300-egr-code-limp-mode.html#post2384762

P0400 alert (is this a cold weather thing)
http://www.peachparts.com/shopforum/diesel-discussion/179448-p0400-alert-cold-weather-thing.html#post1420518

CEL (P0400-EGR flow mulfunction) upon acceleration only
http://www.peachparts.com/shopforum/diesel-discussion/252913-cel-p0400-egr-flow-mulfunction-upon-acceleration-only.html#post2203788

Definitive answer to P0400???
http://www.peachparts.com/shopforum/diesel-discussion/236054-definitive-answer-p0400.html#post2000191

98 E300 P0400 EGR flow code
http://www.peachparts.com/shopforum/diesel-discussion/242888-98-e300-p0400-egr-flow-code.html#post2081616

P0400 CEL question
http://www.peachparts.com/shopforum/diesel-discussion/246738-p0400-cel-question.html#post2130256