2.0 TDI stirbt ab - BMP | Posts 24+

In new filters, where little or no ash has accumulated, this is not a major issue. However, when the filter is nearing its maximum ash capacity, only a relatively small amount of filtering surface area remains available... the pressure drop increases more rapidly, active regeneration cycles are shortened, fuel consumption rises, and an increase in engine oil may occur.
So --> Have the DPF cleaned or regenerated, or replace it.
Personally, I would (if it were my car) immediately replace the differential pressure sensor and possibly have a software update performed at the } if one is available.

Hello,

The engine control unit calculates the amount of soot based on the differential pressure in each operating condition. However, as the ash mass increases with each regeneration cycle, the overall differential pressure values tend to rise over time. Based on this, along with the mileage and fuel consumption, it is possible to estimate the ash mass in the filter.

Based on my experience, the ash mass value tends to be more of an "estimated value" than a precise "measured value." I had my DPF removed after approximately 80,000 km, and although the ash mass calculated by the engine control unit was within the expected range, the filter itself was practically empty. Ultimately, it's difficult to predict how much actual ash is present, as it depends on factors such as the type of engine oil used (additives/oils that produce less ash or are not low-ash), the wear condition of the engine (high or negligible oil consumption), the driving profile, and the fuel used.

If your DPF is still the original one and has never been cleaned, it's very likely to be full given the mileage.

Best regards, Rainer.

Thank you for all the information!

Now I understand what needs to be done with the DPF.

Before that, I'm going to measure the differential pressure myself (just out of curiosity), as I have a differential pressure sensor lying around in my workshop.

Currently, it's in a limp mode, the DPF light is on, and the load is at 61%. Is a forced regeneration too risky?

Best regards,

Quote:

Ist eine Notregeneration zu gefährlich?

It's highly unlikely that it will be possible again.

The DPF should be removed as soon as possible. While you're at it, please also check if there might be another cause for the rapid increase in soot buildup, such as high oil consumption (often from the turbocharger) or excessive carbon deposits in the engine due to a leak in the charge air system (where air intended for combustion escapes into the atmosphere).

The latter are also not uncommon during operation and can be identified by oil traces on the charge air hoses or intercooler, as well as by the corresponding noises.

Best regards, Rainer.

Okay. I couldn't detect any oil consumption, but rather an increase in oil level (possibly due to regeneration of the DPF?).

Can I remove the filter without using a lift?

Best regards,

Okay, I installed a new DPF and changed the oil (it was as thin as water).

I set the ash mass to 0g, then restarted the system several times and cleared the error memory. Now it seems stable for the moment. Is there anything else I need to do? I heard something about a "regeneration cycle"...


Regarding the DPF removal: I also detached the driveshaft on the transmission side, which made the process much easier! (I only removed the sensors and wiring after the DPF was already out).

Best regards,