Hi I just bought my 05 fx4 in may and it still runs great but keeps throwing codes . It comes up as PO349. I thought I read on here that a cam phaser might be stuck in the retarded position? Ivee changed the alternator and the bank 2 cam sensor but my CEL keeps coming on. The truck now has 42000 miles and isn't making the diesel Knock or anything that would make me think the chains were sloppy but Ive got to get that light off. any Ideas or recomendations would be greatly appreciated. Thanks in advance!