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Old 02-22-2001, 12:06 AM   #4
Shik
NASIOC Supporter
 
Member#: 132
Join Date: Jul 1999
Chapter/Region: Tri-State
Location: Central PA
Vehicle:
1997 LGT wagon
2015 WRX on order

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Uh, you missed my point entirely. It doesn't matter where you put the O2 sensor. Being that the first 02 sensor is right after the first cat( which many have expressed a desire to replace with a test pipe such as RalliSpec's which to my knowledge does not include a cat),if the cat is removed, the readings from the O2 sensor are obviously going to be different, thus possibly causing a "check engine" light.

In the various disscussions involving fitting a "test pipe" in place of the OEM cat-fitted up pipe, I did not see any mention about the O2 sensor that is monitoring the performance of the first cat that everyone wants to delete.

I wasn't asking because I didn't know where the O2 sensor would be mounted after the OEM pipe was gone. Jeeze man, I did have a few exhaust systems made in the past.
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