I am at my witts end with this car, I have a practically brand new turbo that's absolutely fine, I have a DPF which was replaced a few years ago, I have fitted a new Air Mass Meter, new fuel filters, regular oil changes, I'm quite sure there is no boost leak, I ran it only on premium fuel but all of a sudden I'm DPF light keeps coming on a its failing to regen. I drove from Essex to Leicester back from visiting family and had to get the missus to preform a forced Regen as we drove, temps went up to 800 centigrade before turbo and the percentages eventually came down to zero but as soon as I accelerated the numbers start climbing fast. I have literally driven 50miles since the regen and the lights back on. To me it looks as through the car is overfueling causing excessive soot but performance wise the car is fine it goes like absolute stink. Only codes that are logged at in relation to the failed regeneration and the inlet manifold flap motor. As far as I am aware the flap motor has zero effect on the running of the engine, I'm 100% sure its not working as the engine shudders on shut down. I have just ordered a new thermostate and Coolant temp sensor but am I missing something here, what could be the causes of this. I really need some advice guys and I'm not talking about suggestions to remove the DPF as that is now illegal. I have VCDS so can check any parameters that may give me a clue but I don't know what I'm looking for.