Two O2 probes, one pre, one post cat???

[Shirley, Mark R]

They are regular O2 sensors, tuned for a slightly different output.
When I worked at Ford, we talked to a O2 release engineer, who stated that 
they WERE different, and that you needed the proper ones in the proper
places.
The ones behind the cat are catalyst monitors, as one person stated, and
they
look for the *abscence* of toggling voltage.  If they start to toggle, the 
OBD2 monitoring sets a code.

-----Original Message-----
From: Chris [mailto:chris at formula3.freeserve.co.uk]
Sent: Monday, January 08, 2001 6:24 PM
To: Rodney Fulk
Subject: Re[2]: Two O2 probes, one pre, one post cat???


Monday, January 08, 2001, 11:10:08 PM, you wrote:


> The '96 Impala came this way as well. They sell false O2 sensors that feed
> an "alls right" signal back to the computer regardless and these fool the
> computer into thinking everything is ok.


Any idea who sells these? Thanks.



-- 
Best regards,
 Chris


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