OM642- Regeneration every 4 miles
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Joined: May 2025
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OM642- Regeneration every 4 miles
I have a 2012 ML350 Bluetec, and it seems as if its regenerating every 4 miles. It seems to be in constant regeneration. I have a brand new original DPF sensor and hoses but seems to still constantly regenerating. I have uploaded a link with a short drive, right during regeneration in the beginning and then once it goes to 0% fill level, how quickly it starts to fill up, which appears to be within 4 or 5 miles. Highway driving is also the same. Can someone please help me? Does this seem normal? Thank you in advance for all your help guys!
https://www.youtube.com/watch?v=3k9l...ature=youtu.be
https://www.youtube.com/watch?v=3k9l...ature=youtu.be
Junior Member
Joined: Nov 2024
Posts: 16
Likes: 6
From: Vienna
2013 CLS 350CDI; 2015 E 250CDI
How many miles does the engine have?
The differential pressure sensor (=DPF sensor) measures the difference in pressure and the beginning and the end of the DPF. Assuming your DPF has already a lot of miles a many regeneration cycles under its belt, it is safe to assume that there is also a lot of ash. The regeneration "burns" soot into ash. When the ash content is to high, the DPF looses its capacity and quicker becomes full with new soot and therefore requires sooner a regeneration. Your diagnosis device should be able to estimate/measure the ash content, maybe this number can give you a rough estimate? The difference in pressure while idling AFTER a regeneration cycle (soot burned) should be as close as possible to 0 mbar. IIRC values <10ish mbar.
The differential pressure sensor (=DPF sensor) measures the difference in pressure and the beginning and the end of the DPF. Assuming your DPF has already a lot of miles a many regeneration cycles under its belt, it is safe to assume that there is also a lot of ash. The regeneration "burns" soot into ash. When the ash content is to high, the DPF looses its capacity and quicker becomes full with new soot and therefore requires sooner a regeneration. Your diagnosis device should be able to estimate/measure the ash content, maybe this number can give you a rough estimate? The difference in pressure while idling AFTER a regeneration cycle (soot burned) should be as close as possible to 0 mbar. IIRC values <10ish mbar.
