re: O2 sensors

From: E. Frank Ball (frankb@sr.hp.com)
Date: Fri Jul 10 1998 - 16:07:47 EDT

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} Thanks for the info, Jules. For those of us with OBD-II, is the O2
} sensor which is used to indirectly control the injectors the one
} before or after the cat? (or both?) Is the O2 sensor also used at
} WOT, or does it revert to lookup tables then?

The O2 sensor before the cat is used to control the engine. The O2
sensor after the cat is used to monitor the perfomance of the cat to
determine when it needs replacement.

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