Skoda DPF fault: Calculated soot mass locked at 60g (hard limit) after turbo vacuum line repair. Can I force a DPF replacement adaptation?
Hi everyone,
Vehicle: Skoda superb 3v5 buildyear 2018 .
My mother recently drove the car in limp mode for about a month with a DPF light and flashing glow plug light. After scanning it, I tracked the issue down to a cracked vacuum line leading to the turbocharger actuator.
I replaced the vacuum line, and the car drives perfectly fine now. Most codes cleared, but the DPF fault remains. During that month of limp mode, we ran fuel additives and did multiple high-RPM highway runs to ensure the filter didn't physically clog up.
To verify, I checked the live data with an OBD2 tool at idle and under load. Here are the current values:
Engine Speed: ~2450 RPM
DPF Differential Pressure: 51 mbar (seems very healthy for this RPM) at idle it is around 12mbar
Soot Mass Measured: 19.21 g
Soot Mass Calculated: 60.00 g (exactly)
My hypothesis:
The ECU calculated a massive soot buildup based on the mileage driven with the turbo fault/incomplete combustion, hitting the hard limit of 60.00g. Because it is locked at 60g calculated, the ECU is now refusing to trigger a normal regeneration out of safety precautions, even though the measured soot mass and differential pressure show the filter is physically clear.
My question:
Am I correct that this is purely a software lock? And is the correct solution to use a diagnostic tool (like iCarsoft VAWS or VCDS) to perform a "DPF Replacement / Adaptation Reset" to force the calculated value back to 0g? Is there any risk of thermal runaway by doing this?
Thanks in advance for your advice!