PO400 EGR Flow Malfunction - Mercedes-Benz Forum
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#1 (permalink) Old 01-09-2009, 06:54 PM
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PO400 EGR Flow Malfunction

My friend's YR 2000 E320 is showing "Check Eng" with Code PO400 EGR flow malfunction. Can somebody help me with this. Thank you in advance.
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#2 (permalink) Old 01-09-2009, 08:16 PM
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Hey, Raylee.

I can't tell you exactly what part of the EGR that pertains to, nor am I sure how precise the codes are. That said, this is how I'd proceed.

1. Disconnect the vacuum line from the EGR valve and fit a longer piece of hose on it. Suck on it and be sure the diaphram holds vacuum (if you have to keep sucking on it that is bad). If it does not hold vacuum, replace the valve.

2. Remove the little plastic check valve (one end won't be connected, this is normal). Note which end is plugged in. Inspect it for cracks/damage and suck on it. It should allow air flow in one direction only. If it is suspect, replace it.

3. If it checks out thus far, then remove the EGR valve and tube. Clean both thoroughly (the tube can be particularly troublesome to clean, pipe cleaners can help) and check the diaphram (again) and make sure the mechanism moves smoothly (visual check) when you apply vacuum. If not, replace it.

4. Inspect the gasket for damage, if any is present, replace it.

5. Replace/clean/reinstall as necessary.

Reset codes and drive car, see if the issue is resolved.

Take care and enjoy the ride,
Greg

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Last edited by Check Codes; 01-09-2009 at 08:18 PM.
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#3 (permalink) Old 01-10-2009, 06:23 AM
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Gregs210,
You have been my help in the past, too. Thanks again, I will try your recommendation.

Another issue, do you think German Start MAF insert is OK to use?
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#4 (permalink) Old 01-10-2009, 08:11 AM
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German Star? Should be fine.
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#5 (permalink) Old 01-10-2009, 09:56 PM
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Matt L,
Thank you very much. I received the part yesterday and found no Bosch marking on it. But it has been installed. I will try out tomorrow on the road.

EGR issue,
All I had to do is to clean the valve with CRC. It was stuck fronzen but with CRC I was able to make it loose. I cleaned it until I could see the valve move in and out nicely.
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#6 (permalink) Old 01-10-2009, 10:55 PM
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only

33 bucks more for the whole bosch maf and autohausaz.com ships for free so it is only about $25 more out of pocket.I like the inserts but for only 25 bucks more a brand new complete unit is more attractive evry day


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#7 (permalink) Old 01-11-2009, 05:10 AM
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This is how it looks like in pictures.
EGR Part#A112-140-0108 . I found OEM for ~$80. You can buy it or you can clean up existing pipe.

This is a process.
You will need:
- wide, flat screw driver (I used it for removing vacuum lines).
- ratchet 3/8"
- extensions 3/8" (for ratchet)
- flexible extension 3/8" (for socket)
- Torx: E10 and E12
- Open-end wrenches: 22mm and 24mm
- thin and long pliers (I used for setup injector switch brackets. I couldn't reach it by fingers).
- torque wrench 3/8"
- Bolt locker. I used "Prime Lock 245 Blue threadlock formula".
- CRC Throttle Body & Air-Intake Cleaner (~$4).
- Sea Foam Motor Treatment (~$8)
- piece of metal cable. I made brush from it. Very last picture shows how to use it.

Open engine cover.

Remove MAF

One torx keeps intake pipe.

Removed intake pipe

This is pipe, which you have to clean up.


Cleaning tool .

Last edited by Bansai; 01-11-2009 at 07:15 AM.
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#8 (permalink) Old 01-11-2009, 06:53 AM
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Bansai,
Your picture help it me very much. When you took out the whole EGR assembly, did you have problem with gaskets breaking? I was afraid of it so I cleaned valve only without taking it out.
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#9 (permalink) Old 01-11-2009, 07:26 AM
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Quote:
Originally Posted by Raylee177 View Post
Bansai,
Your picture help it me very much. When you took out the whole EGR assembly, did you have problem with gaskets breaking? I was afraid of it so I cleaned valve only without taking it out.
Great! I know what you are talking about. I didn't have any issues with gasket. I just carefully removed it and cleaned by paper towel with Sea Foam.
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#10 (permalink) Old 01-12-2009, 05:50 AM
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Only those who have experienced personally will really appreciate value of you guys assistance. Oh, what a feeling when problem is fixed with your help without going to stealership!
Happy New Year to all you good people!
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