It's reading rich.  The output of the sensor is a roughly "S" shaped curve
with the middle range - right around .5 volts - being *very* steep.  Looking
at the output of a working O2 sensor on a properly-tuned engine you'll
typically see very rapid fluctuations above and below the .5 volt output.
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Tom Young                       '81 Vanagon
Lafayette, CA 94549         '82 Westfalia
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----- Original Message -----
From: "Jeff Hammerstrom" <speakerdesign@MSN.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, July 13, 2003 3:05 PM
Subject: O2 sensor output voltage test

> What is the correct voltage range for this thing. I've read it should vary
> and also that it should have steady output. Mine reads fairly steady at
.91
> volts, I believe this is a working sensor reading a rich mixture, correct?
> Thanks