I've had a throttle body replaced ina S80 and itruns finebut
have had all sorts of computer messages and fault code readings [over a year now].
It passed both visual smog inspection, Emissions smog test, but smog pros will nothand
oversmog papers because of computer fault codes. Any suggestions?

 

You didn't say, but I'm guessing that you had the codes cleared and they keep coming back?
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Norwood Assembly

 

I've had them cleared. I'm just tired of paying for diagnostics and would rather clear them myself.

 

After the throttle body was installed was the software downloaded?