P0400 error code on 96 E-320
Don't have the WIS handy for the M104
I did a diy on the m112 on benzworld.org that is similar from the egr on down.Or search the diys on mercedesshop.com someone did a m104 egr awhile back.
always check hoses and fittings first.
www.autohausaz.com for a new egr if yours is shot.
old vacuum operated ones can be cleaned in place.
some stores carry a new tool called snake bit or use an old speedometer cable in a drill to clean the tube.



