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Old 12-06-2003, 09:08 AM   #1
Bobalouy
Scooby Specialist
 
Member#: 827
Join Date: Jan 2000
Chapter/Region: MAIC
Location: Bel Air, MD,USA
Vehicle:
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?

Thanks
Anthony C
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Old 12-06-2003, 11:19 AM   #2
Legacy777
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Member#: 4800
Join Date: Mar 2001
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
1990 Legacy & 97 OBS
AWD 6MT EJ22T AWIC Swap

Default

cat efficiency....that's it.
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