Car model and year: 2011 ML350 Bluetec with 88,000 miles
Symptom: check engine light coming on
Had the 111500 “The Regeneration Frequency of the DPF is not OK” code multiple times during this time, always showed mileage at time of occurrence in the 42+K range. Erased codes at that time.
The Autel MaxiDiag MD808 Pro shows “Pending”, “Stored” and “Permanent” according to its instructions.
Its able to show the true MB codes and not just the standard OBDII Pxxxx or Uxxxx codes. I forgot to record whether it showed “Stored” on the earlier 111500 codes, but since they indicated a frequency of 1 time, many miles ago I’m fairly confident they showed “Stored”. The only one that showed “Stored and Current” was the second 111500 code on 5/25. That’s strange since “Current” is not one of the listings in the scanner user manual. Its weird how new codes pop up with 1 or a few occurrences tied to old mileage. I can’t tell if its just recording the mileage incorrectly or what.
BTW, that scanner does let you reset the oil indicator when you change oil too.
How to do?
This is what Xentry suggests be done for this code.
Change the oil first.
Good to know:
Always change the DPF pressure sensors before changing anything else. They are a “service item” they fail so often! If they do fail they throw out everything else giving you false symptoms.
The pressure sensor location:
I found it hiding behind the air filter housing shown on the pdf with cat. Funny though that pdf seems to say 642 Engine…I believe mine is a OM 641 engine (3.0L 2011 Bluetec ML350).
It worked because it led me to the correct location.
Generally, it depends on the system you have, here are the locations.
- R&I DPF Sensor 642 Eng. No CAT
- R&I DPF Sensor 642 Eng. w-CAT
Hope it helps!