Code P0400, EGR tube clogged i guess. HELP.
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Joined: May 2013
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2004 ML 500
Code P0400, EGR tube clogged i guess. HELP.
I bought my 2004 ML500 (used)in 2008 and it is newly PAID OFF!! Now that its totally mine i want everything perfect. I love this RIG to death. I traveled with my family on long road trips (bought a third row seat bench $1300 to fit everyone), in snow, rain, up hill, down hill and to the marina to drop our boat. This ML is a family member not just a car. But, its sick. 
It has the P0400 code popping up. I guess the EGR tube and valve are dirty or clogged. I love doing the work myself. Can anyone tell or show me how to get to the darn thing. I cant believe they tucked it back behind the engine. ZERO space. Please let me know. It drives fine but, i want it to be perfect. Thank you.
It has the P0400 code popping up. I guess the EGR tube and valve are dirty or clogged. I love doing the work myself. Can anyone tell or show me how to get to the darn thing. I cant believe they tucked it back behind the engine. ZERO space. Please let me know. It drives fine but, i want it to be perfect. Thank you.
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Joined: Oct 2011
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From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Remove the engine cover.
Remove the Air Intake Tube.
Then remove the EGR pipe. You will need a stubby wrench to hold the bottom nut while loosening the top one. They are two different sizes.
If the EGR pipe is not clogged you must order a new EGR Valve, There is no cleaning of the valve.
Remove the Air Intake Tube.
Then remove the EGR pipe. You will need a stubby wrench to hold the bottom nut while loosening the top one. They are two different sizes.
If the EGR pipe is not clogged you must order a new EGR Valve, There is no cleaning of the valve.
Junior Member
Joined: Mar 2013
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2000 ml320
maj. dundee, what size is the stubby wrench, 22mm maybe? the top nut seems to be 25mm, can't figure the size of the bottom. also got the star bolts off the other side, thought if i could remove that side i could see if it was clogged bad or not and it seems to have a small pipe feeding into the valve cover, i couldn't get enough clearance to get it out. gave up and put it all back together for now.
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
maj. dundee, what size is the stubby wrench, 22mm maybe? the top nut seems to be 25mm, can't figure the size of the bottom. also got the star bolts off the other side, thought if i could remove that side i could see if it was clogged bad or not and it seems to have a small pipe feeding into the valve cover, i couldn't get enough clearance to get it out. gave up and put it all back together for now.
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
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Senior Member
Joined: Aug 2017
Posts: 393
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From: Ontario, Canada
2006 ML500, 2008 ML350
Remove the engine cover.
Remove the Air Intake Tube.
Then remove the EGR pipe. You will need a stubby wrench to hold the bottom nut while loosening the top one. They are two different sizes.
If the EGR pipe is not clogged you must order a new EGR Valve, There is no cleaning of the valve.
Remove the Air Intake Tube.
Then remove the EGR pipe. You will need a stubby wrench to hold the bottom nut while loosening the top one. They are two different sizes.
If the EGR pipe is not clogged you must order a new EGR Valve, There is no cleaning of the valve.
Would this be similar for 2006 ML500?
Thanks
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