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E-Class (W211) 2003-2009

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Old 11-13-2011, 04:06 PM   #1
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Drives: 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.
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Old 11-13-2011, 04:47 PM   #2
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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.
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Old 11-13-2011, 06:03 PM   #3
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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.
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Old 11-14-2011, 10:09 AM   #4
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#76 in diagram
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File Type: pdf seal ring.pdf (63.9 KB, 359 views)
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Old 11-14-2011, 10:23 AM   #5
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Thanks so much!!! This clears it up perfectly. I'll check it out.
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Old 12-10-2011, 02:43 PM   #6
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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.
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Old 12-03-2012, 06:30 PM   #7
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Quote:
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.
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Old 12-23-2012, 07:35 PM   #8
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EGR P0402

I cleaned the EGR, new seals, reset the light and it hasn't come back.
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Old 12-23-2012, 11:13 PM   #9
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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?
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Old 12-24-2012, 10:12 AM   #10
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I would expect the light to clear itself if the problem is resolved..

Quote:
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 10:13 AM. Reason: corrected the book number
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Old 12-24-2012, 10:12 AM
 
 
 
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08, 2001, 2008, benz, bluetec, bluetech, clean, e320, egr, flow, forum, mercedes, p0402, s430, w211



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