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Old 06-04-2002, 06:27 PM
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sixto sixto is online now
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,126
The O2 sensor tells it like it is. If there is unburned fuel in the exhaust flow that the pre-cats would have caught, the O2 sensor will communicate such to the ECU. I don't think it will be a problem since those pre-cats can't be very effective even when new.

You'll likely get a check engine light if you remove a cat that is between two O2 sensors.

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