O2 sensor question - '83 Spider

["Bain, Bill" <Bill.Bain@domain.elided>]

OK, my Spider fails emissions with the O2 sensor connected (CO is too
high), but passes easily with it disconnected.  I replaced the O2 sensor
and it still does it!  What's going on here?

Bill Bain 
AROC Atlanta 
'83 Spider (the Smog Queen if I connect it up, practically a ULEV if I
don't) 
'87 Milano (brakes, brakes, brakes) 

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