rpscdn,

Yes, my idle was indeed a little rough, and even at cruising speed on the highway it was a little rough (just a little though). The idle did smooth out a little when the dealer cleaned the throttle body and the manifold nipple (I still don't know exactly which nipple they were referring to), and I think that was indeed 1/2 of the problem, but it also needed the new MAF. Now it is running great!

FYI, the dealer tech I talked to (who was extremely bright and really knew alot about the car's electronic systems) said he typically just replaces the throttle bodies on the 99's, though he did admit that you can usually clean them at least once with success (he cleaned mine, but warned it may need replacing in another 30K or so). The tech did show me their VADIS output info for the car, mostly focusing on the MAF values. Apparently low MAF values can be decently out of range before triggering a MAF specific OBD2 code. I guess the MAF operates on a wide range, and the average has to drop fairly far to get a specific MAF fault. The O2 sensors though definitely seem to pick up on the lean condition's P1171 codes before triggering the MAF fault. On one of our '98 S70s I saw both a MAF code (I forget the number) and an O2 code. That was the easy one to diagnose:)

I have only had my 99 for 2 weeks so far, so I have not had much time to learn its systems and its differences from my 98's. So far it appears to be mostly the electronics and the fly-by-wire technology. Cool stuff, I just hope the reliability is good in the long run. Look to see me posting lots of more questions, and maybe a few answers:)

Thanks!
Vos