Could be a clogged egr valve(remove it and try cleaning it), or dpfe, what are the other "sensor codes".

 

i dont remember the number for the other code just that it was for the oxygen sensor. i figured i need to get the mil eliminator for that one to go away since i removed the cats. but the other i didnt know if that was the same reason for it. i will try and clean the egr and see if that works. if not i will get the dpfe sensor.

 

You could try cleaning or blowing out the dpfe too, worth a shot anyway.