Sudden regeneration CRLB

[user passat b8]

Hi everyone! I am using vag dpf app since november,a great app.I have a problem with my passat B8 CRLB 2.0 tdi regarding sudden increase of soot mass from 14-15g to 22 g which triggers regeneration.This happens at 80-120 km since last regen and is pretty annoying ,as others finds out .Has anybody discovered the real culprit? I was about to change the dpf sensors but reading that doesn”t really helps i have waited to make the step.
Thanks in advance for your answers.

[admin]

You can wait for other answers, but usually this kind of behavior is related to the differential pressure sensor. Anyway the best would be to check the entire system with a diagnostic software to find the real problem.
When the system detectns a failure, the regenerations are closer because the ECU prefers to avoid any risk of fire due to filter clogging.
The sudden jump is exactly that: the ECU detects something not in the common range and force the regeneration setting the soot mass to the field limit.

[gregga]

I think that regeneration is being triggered by measured soot mass which you do not see with this engine group selected - try to use vag com or try to change for different engine group in the app - like CFFB and then you will see measured soot mass values.

I have the same issue still and still do not know what is the reason (I suspect the combustion chamber)...

[FatherOfSound]

Have you find any solution? I have same problem, same car, same engine code. Has anyone of you tried to update ECU software version?

[moog]

Same thing on my CRLB crap...
Until beginning of 2023 regeneration start after 150-200km urban drive...now 60-80-90km...
I change the dif pressure sensors, brand new original crap...nothing change...
I verified the soot Calc and measured also with Vcds (original one) ... Vagdpf read the values ok...
Big difference after a time calculated and measured SOOT... For example Calc ~7 and measured 16... Same value in VCDS...

[Pnevmahyevma]

Same problem on dgda, can you suggest a solution to the problem?

[moog]

Nop... still searching...
I think we need to use it and let things happen ...

[Pnevmahyevma]

I have now discovered that the flow meter affects the measured soot mass. I installed a faulty flow meter and the mass of measured soot began to grow very quickly. 0.03-0.05 grams per second

[Hercules]

I got an audi a3 8v 2015 sportback 2.0tdi crlb motor
216. 000k km before 5 months started to regenerate every 100/150km till 30/50km i went to garage and they told me that nox sensor had a problem they changed it and now it regenerates after 300km but i saw on vag dpf they reset the value from oil Ash residue to 0 that only is the strange.