For resetting Ash Volume/mass (when installing a new particulate filter), use [10 Adaptation].

Regeneration is started with using [11 Coding II].

Adaptation of Carbon Mass (after DPF Replacement)

Prerequisites:

    Ignition ON
    Engine OFF

[Security Access -16]
Enter the code shown in the VCDS pop-up balloon for "Adaptation Enabling"
[Do It!]
[Adaptation - 10]
From the pulldown menu, select the entry for "Carbon Mass (DPF Replacement)" or "Particle filter initialization".
Save a new value of 1 to reset the learned Carbon Mass. It's normal for that value to automatically change to 0 after it has been successfully saved. Check and clear fault codes to make sure none are present.