DPF Regeneration Cycle - V40 D4 MY 2014 (5 cyl)

[Agro]

I started this thread in the V40 section but probably more appropriate in here.

My understanding is that a regeneration cycle differs from model to model diesel engine so would anyone have "specific" knowledge of what exactly happens during a dpf regeneration cycle for this model engine from start to finish?

Reason being is I feel (though am not sure) that this V40 'may be' misbehaving during the regen cycle.

We have two Volvo diesels in the family; a 2014 XC70 2.4 D5 and this V40 2.0 D4 (5cyl). Both have an OBD2 scanner fitted and we use the Car Scanner App to provide details of the DPF Soot level, and DPF Temperature which allows us to know when the regen cycle starts and so ensure we continue to drive the cars in order to complete the cycle.

The XC70 starts the regen process when the DPF Soot Level reaches 29/30grams (about every 250klms). During this time the DPF Temp fluctuates between 550degC and 675degC. The regen is complete when the Soot Level reaches Zero (about 20klms to complete).

The V40 on the other hand starts the regen process at various stages when the Soot Level reaches somewhere between 26grams and 29grams. It gets up to the same temperatures but never seems to drop down to a zero Soot Level. It will stop the regen process at various stages between 6 grams and 14grams of soot. Not at all consistent, and bloody annoying.

So the ultimate question is...... Is this normal operation on this model engine, and if not, what could be wrong?