In a message dated 98-08-07 17:43:52 EDT, kayfremgen@juno.com writes:

<< Hi Michael,
 Thank you for the education us dummies need this kind of information.  I
 have also read the correspondence between yourself and Darrell everything
 is making sense so far.  So here is my last question: If at any time I
 read a negative voltage coming from the O2 sensor does that automatically
 mean it is bad?  Or does the computer know how to compensate for this?
 By the way I have recently a changed the fuel injection temperature
 sensor (it was bad).  Hate to change a part  and then have to say "oops"
 that wasn't it. (been there done that)

 Thank You
 Kai

 87.2 Westy >>
 Hi Kai, you'll never see a negative voltage no matter how lean the mixture
is. The life span of an O2 sensor is 60K. Replace it when it's time. Don' t
worry about the temp sensor if you already replaced it.
 Michael Modl