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Thanks again for the welcome, I really need some help, I'm working on an 2005 f150 5.4 3V, long story short, I've replaced the crank and bearings, timing chains and tentioners, cam plasers, guides, VCT solenoids, cps's, IMRC actuator. It's my son truck, and I won't have to remind him again about oil changes and levels, anyway, after all that the truck runs good, but I'm getting this code P0021. I'm being told that the driver side cam is advanced one tooth. Now looking at the chains and sprockets, the marked links on the chains are in the same position on both left and right sprockets, I recall timing the engine on rebuild and if all the marks were the same then, shoulden't they be the same now? What's wrong with this motor? Thanks for the help, I have changed the VCT and the cps several time's same code.