Yes, the gas cap was on!

Hi John,
You hit the nail on the head when you said my Tundra had warranty issues.  I took it to Toyota of *****and and they did ~$2000 worth of work.  It was all covered under warranty except $7 for gas for the loaner.  They found code P2442 and water in the air valves. (Thats what I had too, JP) The invoice says they performed TSB repair replaced valves and both air pumps.  It took almost all week last week to get things straightened out, though.  

The first guy I talked to in service (on Monday) said he was 99% sure it was a loose gas cap.  He said to tighten the cap and drive it for a couple days to see if the dash lights cleared.  He said it wouldn't hurt to drive it.  Of course, it didn't help the light situation.  I called back Wednesday late afternoon and talked to a different guy who said to bring it in right away.  I took it in Thursday morning and picked it up Friday afternoon, good as new (almost!).  Thanks for your help.
GS
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When I first saw this 08 Tundra, it was in limp-mode and 4-wheel drive. Have you ever seen a vehicle that goes into 4WD if an emissions component is bad??? 

I like the safe diagnosis, the one that covers everything - "loose gas cap". Hmm, well new to me and I've been doing this automotive service/repair thing for a living since 1974... hmm

Is it a new-car warranty issue???