I have a 2015 Ecodiesel (got in 2016) and had to get the regen done November 2021 for the first time. Now in Feb 2023 I'm back at a dealership. They are trying to charge me $4500 for a new exhaust filter. I asked about a regen and they said it couldn't be done because it was too dirty. Told them to try and he said it's no guarantee to work, but I figure it's better to try at $270 and see if it works. If it does not, and I'm not optimistic for some reason, what suggestions are out there? These folks don't seem to know anything about desooting. Is that something a dealership has to do and should suggest being done? Do you think that would solve my problem even if it takes many desooting attempts? $4500 is insane and obviously can't just throw that type of money around. Is there anything further you can explain about the desooting process so I can relay that to whoever I have attempt to do it? 131K miles on it.