Thread: CEL
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Old 06-20-2005, 12:29 AM   #19
Scooby Newbie
Member#: 52202
Join Date: Jan 2004
Chapter/Region: MWSOC
Location: Dayton OH
2001 2.5RS


Correct me if im wrong, but basically the front O2 gets an exhaust reading before the cat, then compares it with a reading from the rear O2 to determine cat efficiency. And it does a couple more things as well. And like piker said, it has most likely just died and needs to be replaced, my comment on hard hits was just a suggestion as to something that could have caused it to die. Since you have no engine mods, it was a possibility, or something got screwed up in the wires, like a short or something. And I believe if the car is running rich that can foul up the O2 sensors.
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