Where in the tune of a 6.0 truck can you alter the O2s working? I can't get any activity from them after doing my VE . Changed out O2s and checked continuity and everything is fine. Trying to do MAF and even turned back to VE with no change. I have to manually turn on LTFTs and closed loop to get to work in scanner but O2s stay between 430s and 470s on both banks. Any help is much appreciated