Hi,

I own a 2014 Skoda Superb II Facelift (CFGB engine) with 230,000 km on the odometer.

I’m having an issue with the DPF.

When driving in the city, the DPF regenerates every 70–100 km.

During highway/extra-urban driving, I’ve managed to reach 270 km between regenerations.

Regenerations in the city are very frequent; the threshold is reached almost immediately.

I use a Vgate iCar Pro2S with the VAGDPF app, which shows an "OIL ASH RESIDUE" value of 107 grams—or 153%. As far as I understand, this is not a good figure.

I’ve done some research online and learned that the Volkswagen Group installed hidden software on all EA189 engines (known as "Dieselgate"), which reportedly impairs the functionality of the DPF and EGR systems.

The VAGDPF app indicates that my car has this software (SW: 03L906018RQ / 9980); this specific version (9980) includes the "Dieselgate" software.

One potential solution would be to "roll back" the software to an earlier version (7xxx or 8xxx)—from before the VW scandal—which should extend the interval between regenerations to 200–400 km.

My plan is as follows: perform a software rollback, carry out a chemical cleaning of the DPF, and replace the pressure sensor.

Is there a good chance this will resolve the issue?

For those who have encountered this problem, how did you fix it?

I’d appreciate hearing as many opinions as possible.

Thank you!!

I think this is the same car as your P2563 thread, so it's worth knowing the turbo fault is still there when you judge any of this.

The figure I'd focus on is the ash. A regeneration burns soot, but it can't burn ash. Ash is what's left from oil additives, plus a little from fuel and engine wear, and it just builds up in the filter over the years. At 230,000 km some is expected. If the app is right that it's at 153% of its limit, there's less room left for soot, so the filter reaches its soot threshold sooner and regenerates more often. That fits what you're seeing in town.

That's why I don't think a software rollback on its own will fix it. Older software won't take ash out of the filter. Also, 9980 is presumably the 23R6 update Skoda did on EA189 engines, and Skoda say the regulators approved it, so going back to the old software means the car is no longer on the approved calibration. I'd check where you stand on that where you live before doing it.

What I'd do instead:

1. Check the differential pressure sensor reading with the engine off. With nothing flowing it should read about zero. If it shows a pressure with the engine stopped, the sensor or its pipes are suspect, and so is the soot figure the ECU is working from. Check both little hoses for splits and blockages while you're there.

2. Get the filter cleaned off the car by someone who does a proper ash clean (heat, then air and vacuum, or a flush), or replace it. A chemical clean through the sensor port mainly works on soot. Ask them for a before and after flow or back pressure figure.

3. Keep an eye on oil use and use the right oil. The Superb handbook lists VW 507 00 for the 125 kW TDI CR with DPF, 4.3 litres with filter. Oil the engine burns adds to the ash.

4. The ash number in the app is the ECU's own estimate, so make sure whoever cleans or replaces the filter resets the DPF values in the ECU afterwards.

If the car is in the UK, keep the invoice. The MOT manual says a DPF that has been cut open and rewelded is a fail unless you can show there was a valid reason, such as cleaning.

no need to open dpf, many people cleaned them by therirselves. look for this video, you ill get all answers.

Worth a go for soot, but bear in mind a flush or DIY clean won't shift much of the ash at 230,000 km. If you do clean it, reset the DPF ash/soot learned values with a diagnostic tool afterwards, or the ECU will keep calculating it as blocked.

in video, this chemisist removed all, first soot and then ash with 25% HCL. listen him again.