Hi! Hope that somebody can help me out with some ideas as to where to look to fix this problem. I have a Skoda Fabia 1.4 TDI, BSM engine and I have a more less constant P0471 and P0472 error message. (Three cylinder engine used in Audi, WV, Seat, Skoda models) I have changed the sensor G450 a number of times both the old original and to the newer updated kind from a reliable WV dealer, there are no visible leaks / clogs on/in the hoses, I measured the electrical impulse on the correct wire and I do get the right voltage on the wires, however the problem persists... Here is a RossTech info : Address 01: Engine (045 906 013 Q) 21:28:32 18.0 Soot Index -15.30 Press. Difference Particle Filter -22.95 Press. Difference Offset 14.9 % Particle Filter Load Coefficient 34.0 Particle Filter Carbon Mass 0.0 Carbon Mass Learned Value Is the Dpf filter too full? at 34.0 I think there is more life in it....last week the engine ran a normal regeneration for like 5 min and that was it. Why do I get the negative values on the pressure difference? Is the G450 sensor not adapting? Do I need a new G450 sensor? Any ideas very much appreciated! I can get additional info/other values via vcds if needed. Thank you!