I also seem to have the same issue. I can not get the 02 sensor, 02 heater and catalyst monitors to go to ready. The mass MAC shop said the front two 02 sensors where fine and showed they were running correct. But they couldn't see the rear two. They also ran the truck on the dyno and performed the drive cycles and with out any luck. Now its off to the dealer.
Before I go to the dealer does anyone know how I can solve this.