Bluetec EGR and Dpf codes
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Joined: Aug 2021
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2008 E320 Bluetec, 1987 190e 2.6, 2007 CL600
Bluetec EGR and Dpf codes
Hoping someone here can give me better guidance on resolving a CEL issue. I originally posted about this on Benzworld and haven’t got much help.
Long story short, I bought a 250k+ mile 2008 e320 with thorough maintenance records for cheap. The dpf was completely blocked after a month of driving going into limp mode. I had the dpf cleaned at a facility and Car ran fine and only had a soft code for the egr which my mechanic let me know about.
about a month later CEL returns for 1 day, it was for the EGR(p0404) then it disappeared. Couple weeks after that CEL came back with a different set of codes for the DPF(p242f and p244b) ash accumulation and high pressure bank 1.
i doubt that the dpf is clogged with ash so soon it was refurbished, I have 0 drivability issues and am still getting 30mpg on the highway. It is my understanding that these cars will not regenerate at all if there are codes for the EGR? And a faulty EGR can potentially throw false codes. I replaced the egr yesterday and the engine was noticeably quieter. The old one was sooted pretty bad and literally broke in half upon removal. This may be the reason the dpf filled up prior to my ownership that egr wasn’t working at all. I erased the egr code after and the high pressure dpf codes went away with it only leaving p242f ash accumulation.
Can anyone tell me if a new egr and manual regeneration are the right steps to correcting these error codes?
I also welcome any ownership tips to keep the car healthy.
Long story short, I bought a 250k+ mile 2008 e320 with thorough maintenance records for cheap. The dpf was completely blocked after a month of driving going into limp mode. I had the dpf cleaned at a facility and Car ran fine and only had a soft code for the egr which my mechanic let me know about.
about a month later CEL returns for 1 day, it was for the EGR(p0404) then it disappeared. Couple weeks after that CEL came back with a different set of codes for the DPF(p242f and p244b) ash accumulation and high pressure bank 1.
i doubt that the dpf is clogged with ash so soon it was refurbished, I have 0 drivability issues and am still getting 30mpg on the highway. It is my understanding that these cars will not regenerate at all if there are codes for the EGR? And a faulty EGR can potentially throw false codes. I replaced the egr yesterday and the engine was noticeably quieter. The old one was sooted pretty bad and literally broke in half upon removal. This may be the reason the dpf filled up prior to my ownership that egr wasn’t working at all. I erased the egr code after and the high pressure dpf codes went away with it only leaving p242f ash accumulation.
Can anyone tell me if a new egr and manual regeneration are the right steps to correcting these error codes?
I also welcome any ownership tips to keep the car healthy.
Last edited by BetterDaze; Dec 6, 2021 at 11:25 AM.
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2009 E320 Bluetec
Welcome! I also recently a acquired a high mileage Bluetec W211. For diesel specific questions, I have had good success at this forum: http://www.peachparts.com/shopforum/diesel-discussion/
It is not model specific but there are a couple of OM642 gurus on there.
Good luck with the DPF - I am currently battling O2 sensor codes but thankfully my DPF seems to be working fine.
It is not model specific but there are a couple of OM642 gurus on there.
Good luck with the DPF - I am currently battling O2 sensor codes but thankfully my DPF seems to be working fine.
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Joined: Aug 2021
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2008 E320 Bluetec, 1987 190e 2.6, 2007 CL600
Thanks for the welcome WarrEagle! I’ll check out that forum too.
My DPF should be good at least another 250,000 miles since it was factory cleaned. There was a Bosch article I Can no longer find that had more info on the DPF system. I learned that the code “p242F- Diesel Particulate Filter Bank 1-Ash acumulation” is a generic code and signifies that regeneration is not active not necessarily that the dpf is clogged. I had this code but was still getting 30mpg on the highway.
Good luck with the o2 sensor issues, there is a past software update specifically for the o2 sensor if you haven’t come across it yet.
My DPF should be good at least another 250,000 miles since it was factory cleaned. There was a Bosch article I Can no longer find that had more info on the DPF system. I learned that the code “p242F- Diesel Particulate Filter Bank 1-Ash acumulation” is a generic code and signifies that regeneration is not active not necessarily that the dpf is clogged. I had this code but was still getting 30mpg on the highway.
Good luck with the o2 sensor issues, there is a past software update specifically for the o2 sensor if you haven’t come across it yet.
Last edited by BetterDaze; Dec 12, 2021 at 06:02 PM.
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Joined: Jul 2021
Posts: 14
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2009 E320 Bluetec
Thanks for the welcome WarrEagle! I’ll check out that forum too.
My DPF should be good at least another 250,000 miles since it was factory cleaned. There was a Bosch article I Can no longer find that had more info on the DPF system. I learned that the code “p242F- Diesel Particulate Filter Bank 1-Ash acumulation” is a generic code and signifies that regeneration is not active not necessarily that the dpf is clogged. I had this code but was still getting 30mpg on the highway.
Good luck with the o2 sensor issues, there is a past software update specifically for the o2 sensor if you haven’t come across it yet.
My DPF should be good at least another 250,000 miles since it was factory cleaned. There was a Bosch article I Can no longer find that had more info on the DPF system. I learned that the code “p242F- Diesel Particulate Filter Bank 1-Ash acumulation” is a generic code and signifies that regeneration is not active not necessarily that the dpf is clogged. I had this code but was still getting 30mpg on the highway.
Good luck with the o2 sensor issues, there is a past software update specifically for the o2 sensor if you haven’t come across it yet.
Thread Starter
Senior Member
Joined: Aug 2021
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2008 E320 Bluetec, 1987 190e 2.6, 2007 CL600
I believe the ecu software updates help the car read all of its sensors correctly. Some emission parts like the EGR and o2 sensor seem to have been revised by MB at some point. But I’m not sure how to tell if a car actually needs one or not.
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Thread Starter
Senior Member
Joined: Aug 2021
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2008 E320 Bluetec, 1987 190e 2.6, 2007 CL600
My egr was physically damaged as well but it’s been a few years… I think it was a generic P0404 code for the egr.
It might also give you an abnormal idle once it opens/closes if it’s bad, additionally you can remove it and check for any blockage from soot
It might also give you an abnormal idle once it opens/closes if it’s bad, additionally you can remove it and check for any blockage from soot
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2009 E320 Bluetec
I'll add an update in case anyone else is interested. My CEL kept coming back for O2 sensor and MAF drift so I decided to get a pro involved - took the car to a European car specialist. They checked everything over and the computer said everything was working properly, no boost leaks, etc. They did see an engine software update available and recommended doing that before anything else. I was skeptical, but went ahead and sure enough, no CEL since. The car definitely drives/shifts differently now, especially when cold. It holds RPM's higher. Regardless, it seems to have fixed the CEL and i have driven over 1k miles since the update.
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Camaro 6
I would go to professionals but if problems are not critical, than maybe i would like to do manual regen and other things. Don't know much about egr but i guess this will be only solution to a problem here. By the way i have heard that it is possible to delete egr and i really want to know if this will help me to improve my auto. I even know where to buy spe diesel and other things for this operation. But i really would like to know more about this
Last edited by Haken; Jan 8, 2024 at 10:45 AM.
Thread Starter
Senior Member
Joined: Aug 2021
Posts: 335
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2008 E320 Bluetec, 1987 190e 2.6, 2007 CL600
I can second the software update, I had it done on mine too a while back that resolved an incurable CEL. As far as the manual dpf regen, I would not recommend that unless you know the sensors and ash content levels are accurate, I melted the core of my original dpf doing so hoping a manual regen would fix it so please learn from my mistake it was an expensive one!
Ive seen a lot of ppl do mods like dpf and egr deletion but personally I haven’t found a reason so far to do so. I did replace my dpf at 265k miles and I’m at 280k miles now. the car seems happy stock with the recommended 5k oil change and staying on top of all filters. I think that might be more so a thing for the Adblue cars
Ive seen a lot of ppl do mods like dpf and egr deletion but personally I haven’t found a reason so far to do so. I did replace my dpf at 265k miles and I’m at 280k miles now. the car seems happy stock with the recommended 5k oil change and staying on top of all filters. I think that might be more so a thing for the Adblue cars
Last edited by BetterDaze; Jan 8, 2024 at 12:56 PM.
