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Old 12-06-2003, 10:08 AM   #1
Scooby Specialist
Member#: 827
Join Date: Jan 2000
Chapter/Region: MAIC
Location: Bel Air, MD,USA
99 2.5rs,BDP,
02 WRX wagon WRB

Default O2 sensor in second cat?

Ok what is the function of the O2 sensor in the second cat on my 99 Rs, is it only there to make sure the cats are working? or does it actually help adjust air/fuel?

Anthony C
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Old 12-06-2003, 12:19 PM   #2
Scooby Guru
Member#: 4800
Join Date: Mar 2001
Chapter/Region: TXIC
Location: Houston, Tx
1990 Legacy & 97 OBS


cat efficiency....that's it.
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