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A good cat will be (I think) about a hundred degrees hotter after than before which shows its burning up those leftover HC tidbits.
On OBD2(post96) the standard was to add an O2 sensor after the cat and compare to the one before. Same frequency=dead cat and dash light lit.
OBD2 also is smart and runs logic tests periodically to see all sensors are working (such as opening the electronic EGR at idle and seeing if the O2 picks that up)
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Meanwhile other things are still happening.
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