Air filter wont change anything unless the filter was plugged upWould not disagree, but I can't figure it out. And the dealership has no incentive to do anything more then what their failure mode tells them to do. They plug it in and it tells them the DPF is full so they do a manual regen, and plug it in again. If it still shows the DPF full they replace the ceramic filter and call it a day. Dodge doesn't pay them to do anything more. I have thought about putting the factory air intake back on to see if that fixes the issue, but I had it on the first time they replaced the filter. I have to say it took longer the first time though?