JPett wondered:
Plus what does it mean that my CATRAT2 failed?
  It means that your Bank 2 catalytic converter is screwed.  But don't worry about that, because you don't have a Bank 2 catalytic converter.  This is rather similar to the reason that you are probably seeing massive failures on cylinders five through eight.

  My point in starting this thread is to wonder whether my failing EGRUPHDIS/EGRDNHDIS results are the same sort of thing, or whether they reflect actual problems with my EGR valve (which I already know to have problems).  Since your car, with no known EGR issues, also produces failing EGRUPHDIS/EGRDNHDIS results, I think I have my answer.

{I do hate spam, but that isn't really part of my email address.  Remove the string ?HatesSpam? from the email address ?BobHatesSpam@blaylock.to? to email me.  No advertisements.  Spammers will be dealt with very harshly!}
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Moonlight Blue 1996 Mercury Mystique GS , Zetec engine, ATX.  No mods. (Well, OK, one mod.  Before I got rid of my previous car, a 1994 Tempo, I swapped radios.  I liked the Tempo's radio better.  That counts as a mod, doesn't it?  I also kept one of my Tempo's wheels to use as a spare.  I hate those stupid ?compact? spares that come with modern cars.  Does this count as a mod?  If so, I guess I have two mods.  Replaced burned/melted blower switch and connector on 19 February 2002 with a 1P3T toggle switch from Marvac and a Molex connector from Rat Shack; I guess this now makes three mods.)