The car also had a P0045 fault due to a faulty connection on the turbo boost control valve. Thats been fixed and that code has gone. I assume thats why the dpf stopped regenerating as tbe turbos not been working. The engine oil is very black so i am thinking its best to change that before trying another forced regen. I am also going to get the pil pick up filter cleaned out in tbesump as i know thays a common problem