HEST light on too often...

[Unilevers]

your turbo is toast - it is fine in the sub 50ish percentages but it cannot swing into the 75+ needed for jaking and proper regens and you have verified that the turbo arm does not have full travel. You are running on borrowed time and no amount of turbo calibrations is going to fix this - it is very common for those turbo's to do this. if you had the mandate removed it wouldn't be a issue as the turbo almost never swings that high but it is needed with the systems functioning.

also driving around at 5 and higher on the differential pressure is extremely bad. you are destroying your engine from the inside out - food for thought.