[s-cars] O2 Code help?

[Scott Munger]

E-Bentley doesn't list the specifics of this code.  They do list "Max
control limit exceeded" and "Min control limit exceeded" but not:

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VAG-COM Version: Release 303.1

 Control Module Part Number: 4A0 907 551 AA
   Component and/or Version: 2,2l R5 MOTR.RHV HS D03
            Software Coding: PMC 4
             Work Shop Code:
 1 Faults Found:
 00537 - Lambda (Oxygen Sensor) Regulation
         11-10 - Control Limit Not Reached - Intermittent
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This code corresponds to a few "misses" I had last weekend when the temp was
around 110.  The car would pull and give up ever so slightly before carrying
on.

Bad O2 sensor?  How many do our cars have?  I've only seen 1 and will a
generic work?

Thanks for any help!

--Scott Munger
'93 S4
'97 Cabriolet