DPF und LMM | Posts 64+

Hi.

Quote:

Can one possibly infer a turbocharger failure based on these images/findings?

No, because it has nothing to do with the turbocharger, and there's nothing visible in the pictures that would suggest damage to the turbocharger (e.g., debris, oil in the exhaust system, etc.).

The images lack context, so I'm referring you to the search function for details on each action. There are many relevant topics that allow for a professional assessment. When measuring the amount of leaked oil, it's important to consider whether the level images were captured in 1 second or 30 seconds.

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,
Unfortunately, your images are missing information about what they are or what they should be.
According to your MSG data, there are no measurement values available for rail pressure/zero quantity calibration for this engine (MKB DAUA?). Does the DDYA in my signature exhibit the same behavior?
I can only compare the return flow rates with the target values for the EA 288 engine for the 2018 Golf (my car has a DDYA 1.6 l TDI EA 288 engine). It might also depend on whether the fuel injection system is from Bosch or Delphi.
The total return flow at idle is acceptable (only Bosch), but the deviation from cylinder 3 is somewhat noticeable.
Does the car now pass the emissions test?
hg
Herbert.

Hi,

"So, after replacing the DPF and particulate sensor, the emissions test ('AU') showed 'only' 160,000 particles. -> The emissions test was passed, as the limit is 250,000 particles."

Compared to the almost 7 million particles previously, this is a significant difference. I conclude that the DPF was actually defective and was damaged by the cleaning process.

Compared to the air quality measurement taken 2 years ago, which showed only 300 particles, 160,000 is still very high.

What is the reason for that? That's my next task.

The error log indicates a fault with the NOx sensor 1 and that the SCR catalyst is not working effectively.

This error occurred for the first time now.
If I'm interpreting this correctly, the NOx sensor 1 is defective (showing 0 ppm, 0 volts, and is inactive), which is also why the second entry, "SCR NOx catalyst, efficiency too low," appears.

What surprises me is that only one NOx sensor is installed. Where does the SCR catalyst come from, the one that's supposed to be before and after the NOx sensor?

Replacing the NOx sensors should prevent both entries from reappearing.

Could this further reduce the number of particles, or is the problem already caused by incomplete combustion?

Or could it be that the Add Blue injector valve is clogged?

I also decided to try a diesel additive to clean the fuel injection system, given the upcoming ESD quantity measurement.

Quote:

Compared to the AU measurement from 2 years ago, where he only had 300 particles, 160,000 is still very high.

If the exhaust system after the DPF hasn't been replaced, it's probably full of soot... what happens to that soot when you accelerate hard?

dieselschrauber wrote:

Quote: Compared to the AU measurement from 2 years ago, where he only had 300 particles, 160,000 is still very high. If the exhaust system after the DPF hasn't been replaced, it's probably full of soot... what likely happens to that soot when you accelerate hard?

Yes, that's right, I hadn't thought of that. Thank you.