CFFB: Regeneration will nicht enden | Posts 16+

...it shouldn't fail because of the CSV file; here's the attachment. However, it only works with 5 parameters. I don't understand how to save the desired, more detailed measurements, and this morning I needed to get it done quickly.

I was trying to say that, if the differential pressure sensor malfunctions, it doesn't necessarily display completely incorrect values, but rather values that are consistently too high at all times (essentially, proportionally increased), which I find surprising, especially since I don't know how this sensor works.

The exhaust system isn't pinched, and the tailpipe is also clear (so there's no tennis ball or anything similar blocking either of the outlets). I specifically checked that today when I was changing the wheels.

With a bit of luck, I can arrange a stage or pit. I think it would be exciting to drive with an exhaust system that is progressively being removed .

Hi,

The current score:

Exhaust system okay, but DPF sealed; for this, the front axle needs to be removed, etc.

Interestingly, some values related to the DPF had already been reset at some point, and since then, the amount of soot buildup has been steadily increasing. I never reset anything myself; it must have been done by the dealer, probably as part of the new software update for the EA189 engine (about 4 years ago).

I'm quite surprised that the DPF is clogged. I'm the original owner of the Sharan, and the mileage of 125,000 km is correct. And, at most, I've only driven it for a maximum of 5 regeneration cycles throughout its entire lifespan. And the Sharan is not a car primarily used for short trips.

Sure, here is the translation of the text from German to English:

"LG" is an abbreviation for "Liebe Grüße," which means "Best regards" or "Best wishes" in English.

Hello,

A possible reason for excessive ash buildup could be overfilling the engine with motor oil, or generally having a high oil consumption rate.
If, in addition to that, the wrong type of engine oil is used (one that contains ash), or if other additives for engine oil or fuel are used that are not suitable for DPFs, that only makes the situation worse.

Best regards, Rainer.

Thank you for the feedback!

The engine has received new motor oil once a year (Super Tronic LongLife III SAE 5W-30). And the oil level has not noticeably decreased throughout any year, and that is still the case currently. (And this is not because the oil is being diluted with water, but because there is no noticeable oil consumption.)

The car was almost always fueled with branded gasoline; although it was usually just the "standard" diesel, which should be sufficient.

I simply don't know what I can change in the future. Sometimes I drive 500 km on the highway at 180 km/h, and sometimes I drive slowly and cautiously, and I'm usually always looking ahead. I avoid short distances (less than 10 km).

"If only I knew what exactly was wrong. As far as I know, not every modified EA189 engine has problems, so it can't be solely attributed to that, can it?"

Quote:

The car was almost always fueled with branded gasoline; although it was usually just the "standard" diesel, which should be sufficient anyway?

Yes.

It would be interesting to know how the high pressure differential is created, but I suspect the old DPF must be returned as a complete unit for the deposit refund.

It might be possible to deduce the origin of the residues by analyzing them.

However, I would still like to check the DPF carefully and take some photos to see if it's possible to identify the year of manufacture anywhere.
This should, of course, match the car, and be no more than 1 year older. Also, check all the fittings on the exhaust, what was loosened, and whether anything was loosened.

Hello Rainer,

I don't quite understand the direction your questions are heading, so just to be on the safe side, I'd like to ask for clarification:

The repair shop I trust the least (well, I think they're honest, I know several of the employees personally) said that the DPF had probably just been flushed, which would bring the values back into the correct range.
Sure, I can follow up on Monday to see if the filter content provides any clues about the cause of the blockage.

Do you think the DPF is significantly older than the Sharan itself? If so, it would have had to be installed as an old part in new cars back then. If someone had disassembled the front axle in the last 9 years, I would have definitely noticed. This wouldn't have happened at the official dealership when the software update was installed, as it's quite a complex procedure.

And the fittings on the exhaust: As far as I know, these were loosened for the first time, because there was no previous reason to do so. Do you think that the mechanics in the workshop might not have actually worked on the exhaust at all? Or why the mention of the fittings?

Hello,

Consider the cost of a DPF and how you might obtain one for free, for example, by exchanging an old one for a new one. The financial incentive is certainly there.

This is not meant to be an accusation, but you should ask yourself why your DPF is completely full after only 125,000 km, while it lasts for well over 250,000 km for everyone else.

Best regards, Rainer.

Hello,

Yes, but why is mine so full?

But when would I have supposedly been given an old DPF? From the factory? I picked up the Sharan in Wolfsburg.

To the best of my knowledge, the DPF was only "unlocked" for the first time now. However, if it's not currently completely full, then another component must have caused the excessive pressure difference, because I measured that myself.

Perhaps I'm being too naive? Feel free to write down which scenario could explain the current situation. I'm not taking this as an accusation, but I would appreciate plausible explanations. Before I start doubting my driving style too much...^^

Hi there.
was heißt DPF dicht? Gibt es Fotos? Ash, soot?
Ich habe schon verstanden, daß der gemessene Differenzdruck jenseits ist. Bei dem km Stand ist eine Überfüllung mit Asche aber nicht glaubhaft. Sibefore that: https://community.dieselschrauber.org/en/viewtopic.php?p=255445#255445
and then https://community.dieselschrauber.org/en/viewtopic.php?p=255446#255446
That's also an EA189 2.0 TDI.
hg
Herbert.

Hi,

Thank you for your feedback.

It would be helpful to know if the DPF is clogged with soot or ash. I'm asking because I don't have any specific details from the workshop.

In the workshop, I was asked if I was able to reset the DPF, which should have been done at least once. I'm confident I could do it using VCDS, but I've never actually done it myself. However, I can imagine that when the new software was installed, someone might have "delved deep" into the digital system.
Could a misconfiguration from back then (about 4 years ago) be a possible reason for a DPF that is aging too quickly?

I'm quite annoyed that I fulfilled every regeneration requirement for the car (which occurred approximately every 600 km). If there are other users who don't pay attention to that at all, but still manage to reach 250,000 km...

Sure, here is the translation of the text from German to English:

"LG" is an abbreviation for "Liebe Grüße," which means "Best regards" or "Best wishes" in English.

Hi,
It would be best if you could take some pictures. Please include pictures of the inside of the DPF from the engine side, and a picture of the DPF showing the part number and manufacturing date. Without that information, it's impossible to know for sure.
I believe the claim that the ash value was reset during the software update is speculation. Furthermore, at the mileage it had at the time (almost), it wouldn't have made much of a difference.
Please explain what you meant in your previous post when you said "the DPF would only have been flushed out."
hg
Herbert.

Hello,

Okay, I'm trying to get some pictures. I won't be able to see the car again until at least Monday. And only then will I be able to provide more information about the DPF treatment, if you have any questions. I'll let you know whether it was replaced or refurbished, or whatever the case may be.

It's worth noting that, so far, I have no reason to doubt the competence or professionalism of the current workshop. As a layperson, one is always somewhat vulnerable, but in this case, VCDS is extremely helpful in preventing being misled.

Thank you for your insightful questions, which allow me to thoroughly examine my current problem.

I'll get back to you as soon as I know more. Best regards.

Hi,

To begin with, I don't have any pictures. The situation is as follows:

Erst habe man, beginnend ab dem Endtopf, die Auspuffanlage abgebaut. Der Differenzdruck sei immer zu hoch gewesen, bis man vorne hinter dem Motor den DPF gereinigt habe. Es sei also wieder der originale DPF verbaut, welchen ein eigens dafür angeschafftes Reinigungsgerät nach der Reinigung als okay ausgegeben hätte, wobei man hier zwischen Asche und Ruß nicht gesichert unterscheiden könne. Beim Wiederzusammenbau habe man dann festgestellt, dass der Abgasfluss wieder über Gebühr verhindert war, was am SCR-KAT gelegen habe. Nun sei ein neuer KAT verbaut, und jetzt scheint alles wieder okay. Vorerst.

Thus, the worst-case scenario regarding the exhaust system on the Sharan had likely occurred. The mechanics stated that it was not common for the DPF to be clogged and the SCR catalyst to be broken at the same time with approximately 130,000 km on the odometer. However, it does happen occasionally, although it's not that unusual. Longer periods of trouble-free operation are more likely to be seen in a typical "company car" that accumulates many kilometers in a short amount of time.

It cannot be ruled out that the underlying defect is still present. For example, there could be a latent malfunction of the engine, which is currently within the tolerance range of corresponding measurements, because we are unable to diagnose anything specific.

After approximately 400 kilometers, the first regeneration was required yesterday following the repair.

If there are any specific readings that I should pay particular attention to, I would appreciate any guidance you can provide.

From my perspective, I must say that I am, of course, not happy about the repair. However, I do not have the impression that I was misled by the workshop in any way, such that unnecessary or excessive repairs were carried out, or that some kind of conspiracy was at play. In the opinion of the workshop, the exhaust cleaning system in the CFFB engine is extremely prone to failure, and the changes made after the emissions scandal certainly did not improve the situation.

Sure, here is the translation of the text from German to English:

"LG" is an abbreviation for "Liebe Grüße," which means "Best regards" or "Best wishes" in English.

Hello,

Thank you for the feedback. I would like to carefully examine the behavior of the temperature readings, in comparison to vehicles that are functioning correctly.

If there is no significant oil consumption, overfilling, or the addition of strange fuel additives, and the engine is not producing excessive soot, then there is simply nothing to clog the system.
All of this can be clarified with very little effort.

So, either the regeneration process is repeatedly interrupted due to incorrect readings from the ECU, or one of the points mentioned above applies.

See reasons for failed regenerations.

Best regards, Rainer.

Hello Rainer,

Thank you for your reply.

I can definitely rule out oil consumption, overfilling, and strange additives.
I don't know if the engine is producing excessive soot. But I can say that the inside of the exhaust pipe (or rather, both exhaust pipes) is clean. So, no soot is coming out the back.

Which temperatures should I be monitoring? Currently, I'm seeing "Exhaust Temperature Sensor 1," but there are also sensors numbered 2, 3, and 4?

In the attached document, you'll find a visualization of the first regeneration process after the repair, which I started recording around the halfway point, although I'm not entirely sure of the exact timing. The calculated soot mass decreased consistently to 5 grams, and that's when the regeneration process stopped. Should this value ideally decrease further to 0 grams?
The road was slick during the regeneration phase. I didn't want to drive fast or at a high speed.

Sure, here is the translation of the text from German to English:

"LG" is an abbreviation for "Liebe Grüße," which means "Best regards" or "Best wishes" in English.

Hi,
It would be interesting to know what values are currently entered for the ash mass and the offset of the differential pressure sensor.
hg
Herbert.