From the exploded view of the engine, this being a 2007 3.5L Cyclone, 24V 6 cylinder with DOHC, I can see where there are two Cam Phasers, one for the left bank, one for the right. I'm pretty sure they changed both, at least that is what the paper work states. But they only changed one Sensor. Perhaps it is the 2nd sensor bad now. They broke one of the plastic timing chain tensioners and had to change it. Was your timing chain bad in that it would slip a tooth? The timing seems ok, at least it runs smooth, etc. It is a scary thing letting a dealer work on your motor. You never really know if a tech got in a hurry and left a bolt out or something.

Took it back to the dealers this morning. They say the Bank 1 timing chain was 1 tooth off. Wouldn't it make sense to re-verify the timing any time you had the timing chain off?

You would think they would check the timing, did you get it back yet?

It is actually federal law that anything that can effect emmissions be set to specs.

Kev, not yet. We dropped it off on Monday morning. They found out yesterday that the timing was off on Bank 1 now causing the P0016 code. They found this by running the car and reading the Live Data from the OBD2 system. Pretty cool. Prior to this all fails were on BANK 2. I found out there are two timing chains which makes sense, I was having a hard time wondering how only 1 bank could be affected by the chain being off one tooth.

I think, if there are not any more hiccups, we should get it back today. Hope there are no leaks or anything.

thanks. I suppose they just didn't take the time then to run it and monitor the readings or something.

Update: Car back from dealer, runs good, no light so far. One tooth off on the Bank 1 timing chain. They said the tech ran it while monitoring the live data and could see the difference in timing from spec. confirming it was a tooth off. Here's hoping I'm done with this one for a while.