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Fixing emissions problems isn't always a 1-2-3 fix although in certain cases the cause of failure is worse than obvious.
It's much more complex than that. Sometimes a fix CAN and does take one or two tries before it is done right. I'm not talking about going down the street to a "guaranteed to pass" place that will shift everything around and then shift it back when you go back there after passing. (That is a route you can follow, but most dealers won't do it that way).
With a higher temp reading, you are looking perhaps at a lean mixture issue. That's usually the case with NOx. That means, a leaking intake hose, a bad fuel pump or plugged fuel filter, crapped-up fuel injectors, etc. Or bad combustion chamber deposits.
I would recommend having someone check the thing out for you--someone who knows about that. The dealer did what would fix most emissions failures. I have done that before to my own stuff; replaced the airflow meter and cat, and flown through emissions with flying colors. But it isn't necessarily going to work every time.
Also verify timing.
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1992 940 wagon, very low miles
as well as others.
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