Dpf will only run a regen if up to temp though.
I am thinking stats, similar prob on the e46 330ci in terms of temp.
When it was in for mapping it did throw up a dpf fault but not sure what as it was replaced not long before i got it.
Just curious if I'm on the right path before i start getting parts and eating my time, thankfully no tools needed for anything specific, already had some bits of previously without hassle.