So when you clear the P226C code does it come back right away?
If so then I would do as you described.
I have had this code pop up twice this year approximately 6 months apart.
I ran some Archoil cleaner P/N AR6400-D after the last code in June.
Still continue to monitor and exercise the turbo vane for now.
Right now mine is too random to justify the expense but I believe you are on the right track.
Please keep us posted on your progress.
As far as the tune concern, I believe the damage was done before by the EGR pumping the soot back through the engine.
We are running much cleaner now.
2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit and 50 Gallon auxiliary fuel tank.
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