Speedsailz

Thanks for the reply, before I go ahead and swap out the outlet temp sensor... it was ref your comment on soot levels. one strange observation I see is that the soot mass calculated can be over 24g (triggering regen) but the soot mass calculated only ever sits as a max 5g. Then during the regen towards the end when the calculated gets to 17.77g the measured starts to go minus numbers. Does that give any more clues? TIA I can attach a log if it helps

Yes understood, if you monitor the live data how do you know if its correct or false? My inlet and outlet temperatures look sensible. a graph is attached. I can get a DPF inlet temp of 630 and Outlet at the same time round about 506, but then it drops back off again, and I have to try and get back up with loading the engine. So the whole regen can take me 70 miles or so whereas it should stay at 600+ and get it done asap and burnt the soot off. I don't have one single DTC. Appreciate the help

Raul, what were the symptoms behind you needing to resolve this issue please. I have an ongoing DPF issue where temperature keeps dropping during a regen and I suspect what you've found. Many Thanks