EGR P0402 - MBWorld.org Forums

Notices
E-Class (W211) 2003-2009

EGR P0402

Reply

 
 
Old 11-13-2011, 05:06 PM
  #1
Junior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
2008 E320 Bluetec
EGR P0402

I have an intermittent check engine light due to code p0402. I know this is related to EGR system but not certain where to start. Any help would be appreciated. I have cleaned the EGR valve but didn't go any deeper. When I clear the light, it comes back in about a week. Any ideas? 2008 E320 Bluetec 94,000 miles.
Chip2011 is offline  
Reply With Quote
Old 11-13-2011, 05:47 PM
  #2
MBWorld Fanatic!
 
konigstiger's Avatar
 
Join Date: Jul 2003
Location: North Scottsdale, AZ
Posts: 8,634
Thanked 540 Times in 463 Posts
'71 Pinto
Check condition of seal ring (part # 0259973448 about $2) if fine you may need to replace valve - current part # 6421401860 to comparison shop, parts.com $312.
konigstiger is offline  
Reply With Quote
Old 11-13-2011, 07:03 PM
  #3
Junior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
2008 E320 Bluetec
I haven't seen a seal ring on the EGR. (maybe that is the problem!!!). Is this where the EGR attaches to the engine. There are two screws that hold the EGR onto the engine. I can also contact the parts guy at MB.
Chip2011 is offline  
Reply With Quote
Old 11-14-2011, 11:09 AM
  #4
MBWorld Fanatic!
 
konigstiger's Avatar
 
Join Date: Jul 2003
Location: North Scottsdale, AZ
Posts: 8,634
Thanked 540 Times in 463 Posts
'71 Pinto
#76 in diagram
Attached Files
File Type: pdf
seal ring.pdf (63.9 KB, 665 views)
konigstiger is offline  
Reply With Quote
Old 11-14-2011, 11:23 AM
  #5
Junior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
2008 E320 Bluetec
Thanks so much!!! This clears it up perfectly. I'll check it out.
Chip2011 is offline  
Reply With Quote
Old 12-10-2011, 03:43 PM
  #6
Junior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
2008 E320 Bluetec
EGR check engine light on/off

I cleaned up the EGR; reset the check engine light and then the check engine returned (about 40 miles after reset) and then went away after driving around 60 miles. Does anyone know why it would go out after coming on? Any ideas on this would be great to hear.

I have since driven the car over 5000 miles with no check engine light. I'm thinking problem is fixed for now.

2008 e320 bluetec
97,000 miles.
Chip2011 is offline  
Reply With Quote
Old 12-03-2012, 07:30 PM
  #7
Newbie
 
Join Date: Aug 2011
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
2008 E320 Bluetec
Originally Posted by Chip2011 View Post
I cleaned up the EGR; reset the check engine light and then the check engine returned (about 40 miles after reset) and then went away after driving around 60 miles. Does anyone know why it would go out after coming on? Any ideas on this would be great to hear.

I have since driven the car over 5000 miles with no check engine light. I'm thinking problem is fixed for now.

2008 e320 bluetec
97,000 miles.
Did you ever get this problem resolved? I've got the same exact car and same exact problem.
avbar is offline  
Reply With Quote
Old 12-23-2012, 08:35 PM
  #8
Junior Member
Thread Starter
 
Join Date: Nov 2011
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
2008 E320 Bluetec
EGR P0402

I cleaned the EGR, new seals, reset the light and it hasn't come back.
Chip2011 is offline  
Reply With Quote
Old 12-24-2012, 12:13 AM
  #9
Newbie
 
Join Date: Aug 2011
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
2008 E320 Bluetec
Originally Posted by Chip2011 View Post
I cleaned the EGR, new seals, reset the light and it hasn't come back.
Thanks Chip,

I've cleaned my EGR, but the CEL keeps coming on and going off randomly. About every other day. The car runs perfectly by the way.

I haven't "reset" the light. I don't have a scanner or anything. Do you think that the CEL needs to be cleared, or will it clear itself if the problem is fixed?
Or should I run by some auto shop/dealer/autozone and have them clear it to see if it returns?

Any thoughts?
avbar is offline  
Reply With Quote
Old 12-24-2012, 11:12 AM
  #10
Member
 
Join Date: Jan 2012
Location: PA, USA
Posts: 244
Thanks: 0
Thanked 4 Times in 4 Posts
2004 E320 4matic Sedan
I would expect the light to clear itself if the problem is resolved..

Originally Posted by avbar View Post
Thanks Chip,

I've cleaned my EGR, but the CEL keeps coming on and going off randomly. About every other day. The car runs perfectly by the way.

I haven't "reset" the light. I don't have a scanner or anything. Do you think that the CEL needs to be cleared, or will it clear itself if the problem is fixed?
Or should I run by some auto shop/dealer/autozone and have them clear it to see if it returns?

Any thoughts?
Once it has run the Exhaust Gas Recirculation monitor successfully, it should (may ?), turn off the light. That said, a simple code reader and clearer doesn't have to cost much and can help with troubleshooting your next issue. It won't replace StarDiad/DASXentry, but it's helpful.

If you want to know more about OBD-II codes and such, then Haynes has an excellent book "OBD-II & Electronic Engine Management Systems". Haynes Techbook 10206, ISBN 1 56392 612 1. It is written for the technically-minded, lay-person. I got mine at Pep Boys.

Last edited by ozusa; 12-24-2012 at 11:13 AM. Reason: corrected the book number
ozusa is offline  
Reply With Quote
 
 
 

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Ego55
GL Class (X164)
33
05-18-2016 02:25 PM
cogzoid
E-Class (W210)
3
09-30-2015 12:55 PM
pdisher
E-Class (W212)
2
09-25-2015 06:13 PM
larsianer
E-Class (W211)
9
09-07-2015 03:44 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:48 AM.


Copyright 2001-2012 InternetBrands, Inc. / MBWorld.org. All Rights Reserved. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: