RE: Braking the Ceramic Stuff out of my CAT's...OXS after

[Henry Harper <hah@srv.net>]

Elliot sed:
> I don't think that they did this until the A4's.  As far as I can tell
> there's no mention of any O2 sensors after the cat for the 92-95 90's.
> I haven't seen any, either (though I never really looked for one).

> Ti Kan wrote:
> >
[some federal crime or other]
> > > Shouldn't, I don't think there are any electronics back that far.
> >
> > I don't know about your vintage, but recent Audis (both 2.8 V6 and 1.8T)
> > have oxygen sensors *before and after* the catalytic convertor (yes, four
> > sensors total on the V6).  This is to provide the computer with information
> > about whether the cat is working.  On these cars, a failed cat will
> > generate a fault and stored in fault memory.
> >

Isn't this just a part of OBD-II? All post-96 US-spec cars (not just Audis) 
should have an OXS after the cat[s] (among other "improvements" over OBD 
"classic").

Henry Harper
http://www.srv.net/~hah
1991 200 quattro, 89k, OBD classic
1988 GTI 16v, 179k, OBD lite, might have some codes in the knock sensor box, 
did I mention the tranny is dead