Pre + Post O2s

[Ord Millar]

I am pretty sure that the pre and post O2 sensors are the same part on my
car - at least I can't tell any difference externally, and may have
accidentally swapped then at one time or another.


-----Original Message-----
From: Bruce Plecan <nacelp at bright.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Tuesday, March 30, 1999 9:08 PM
Subject: Pre + Post O2s


>As I understand things, the cat converters are a reducing chemical
reaction,
>so
>they consum calories to react.  (True or False?).
>
>The rear O2 sensor would run cooler then the front.
>
>So, the rear O2 in order to measure the effectiveness of the cat would need
>to
>operate at least at the same temp as the front.  So it would need a
"better"
>heater.
>
>Since it might not track the front too well, then it's "range" would need
to
>be greater.
>
>Only have any documents to compare the above to, or does it make sense
>to someone other than me?.
>Bashful
>
>
>