DPF Full: Audi A5 3.0 TDI - Max Load Exceeded

Hello. The vehicle is in a fault mode and is no longer regenerating.

The oil level is at 0.43 liters. According to my research, the upper limit is 0.52 liters, so it should actually still be regenerating, right?

What I'm noticing is that a temperature reading is consistently at -270 degrees... see the error scan. Is this the primary issue?

The DPF (Diesel Particulate Filter) is being removed and cleaned because it's nearing its limit.

However, regarding the sensor technology, I'm a bit unsure about the vehicle, and there are some things that should be checked beforehand, and it's important to determine exactly which temperature sensor is mentioned in the error log. Therefore, my question to the specialists is how best to proceed. Thank you.

Hi,

Good question . Not all temperature readings available in the extended metrics from the DPF need to be present and valid.

That must be it.
- Temperature, charger input.
- before DPF
- after DPF

Therefore, three sensors must be screwed onto the loader/DPF fitting, and my "upstream of DPF" sensor would also serve as the lambda probe.
If you are seeing replacement values or -2xx°C for any of the three values mentioned above in the measurement readings, then the corresponding sensor or its wiring is likely defective.

Best regards, Rainer.

Hi there,
Are you sure that the limit for ash volume is 0.52 liters? I thought I read that for all 6-cylinder CR engines with a 4-letter engine code, the maximum specified ash volume is only 0.36 liters.

Best regards from Berlin.
olli

Quote:

But that's a must: - Temperature, charger input. - before DPF - after DPF

Thank you, Rainer. I have now found the three sensors in the respective measurement data blocks. The values seem plausible so far.

However, I find these error log entries confusing. In my understanding, something like this shouldn't be included in the error log; at the very least, it should be marked as "N/A" (Not Available) in the measurement data.

Regarding the actual error... what does "maximum load exceeded" actually mean? Does it mean "full of soot" or that the ash limit has been reached? Such vague statements don't necessarily make troubleshooting any easier.

Quote:

Hi, Are you sure that the limit for ash volume is 0.52 liters? I seem to have read that for all 6-cylinder CR engines with a 4-letter engine code, the maximum specified ash volume is only 0.36 liters.

No, I'm not. I just Googled that yesterday because I couldn't find anything quickly here. That would certainly explain everything. May I ask where that information comes from?

Hi there,
As I mentioned before, I'm not entirely sure anymore, it might have been EL*A. Or maybe a tooltip in VCDS.
Otherwise, these figures also appear in the Skoda forum.
around; about; all over; to go around; to revolve; to circulate.

DPF ash mass limits:

4-cylinder common rail diesel engines: 60g (MWB 68 field 2), e.g., (BRE/BRF/BVG/BMM/BMN/etc.)
4-cylinder CR engines: 0.175 L / 175 ml (particulate filter oil ash volume) (CAGB/CAHA/CAHB/etc.) (also 2.0 L in the A1 8X).
4-cylinder CR engines, 1.6L, Generation 1 - 70g (8P, 8X, etc.)
4-cylinder CR engines, 1.6L, Generation 2 - 175ml (0.175 L) (except for A3 8V).
4-cylinder CR engines (Audi A3 8V), 1.6L and 2.0L - 80 grams.
6-cylinder CR engines, 3-character code: MWB 104/1 - 460ml (0.46L) (ASB/BMK/BPP/BNG/BSG)
6-cylinder CR engines, 4-digit identification codes: MWB 104/1 - 360ml (0.36L) (CANA, CANB, CANCE, CAND, CDYA, CDYB, CDYC).
6-cylinder CR engine (A8 4H) - 375 ml (0.375 liters).
6-cylinder CR engine (B8 series) - all models except CKVB and CKVC - 370ml (0.370 liters).
6-cylinder CR engine (B8 series) - ONLY compatible with CVKB and CKVC models - 380ml (0.38L).
6-cylinder CR engine (4th generation series), suitable ONLY for CVUA and CVUB vehicles - 240ml (0.240 liters).
6-cylinder CR engine (4th generation series), compatible with CKVB and CKVC models only - 360ml (0.360 liters).
6-cylinder CR engine (4th generation series), compatible only with part numbers CDUC, CDUD, CLAA, and CLAB - 370ml (0.370 liters).
6-cylinder CR engine (4th generation series) - ONLY compatible with CRTD, CRTE, CRTF, and CRCB models - 380ml (0.380 liters).
6-cylinder CR engine (4G series), ONLY for CGQB models - 420ml (0.420 liters).
8-cylinder 4.2L TDI-CR A8 4H - 550ml (0.55L)



Best regards from Berlin.
olli

Thanks for the information. We'll see what it looks like when it comes back from the cleaners. That should be next week.

The CAPA (Corrective Action and Preventive Action) was also installed in the A4 B8 models. According to maintenance records, specifically for A4 models from 2008 onwards, the ash limit for all 3.0L V6 TDI engines installed during that period is 370 ml.
hg
Herbert.

Thank you again.

The actual maximum ash volume is indeed 0.37 liters.

0.43 liters were stored, which is quite full.

After cleaning (by a professional company), the filter lost a total of 137 grams in weight (due to soot and ash).

Thank you for the feedback!