You need a boost fooler.I put one on mine and it got rid of the codes.It keeps the computer from seeing over 20 to 21 psi of boost pressure.I am hitting 30 to 32psi boost with no codes.I have the reg.return system and I am running 68psi on fuel vs 55ish aswell.
2001 f250 CCSB 4WD 5"Exhaust,
BallBuster Turbo,ITP Regulated Return,03 Headlights
CCV-MOD,,AIH Delete,Built-Trans,Programmer,DIY Intake,EBPV delete,Boost-fooler,Gauges,305's