Isx cm2250

[showmat]

Just purchased a 2102 KW w/ ISX 450 CM2250
Been in shop six times already
Constant regens and codes etc
Last time at KW they reset the codes after a derate with engine stop
They also did regen with they said didn't pass and said I may need to replace the DPF filter
Drive 1000 miles in which I had to do 2-3 more regens when I stopped then stop engine and derate came came and I went to a shop and had DPF changed
Reset code / regen and drive 500 more miles
Engine ran great except Inlet pressure code came up
Also was getting 3.5-4 mpg
Parked truck in Vegas and am heading back on Tuesday
I watched alot of your videos on the egr tuneup etc
I am going to change the sensors and clean all the parts
Truck was recently pm'd with exception of air cleaner which I will change also
I am afraid of the dealers as they reset the codes and do the regens but do not clean or diagnose
If I am successful at the above do I need to go to a shop to reset the codes?
Do I need to regen?
This was really a good clean truck that I believe was never maintained properly
If you have any suggestions please forward
I will send updates
Thanks
Showmat