O2 sensor in second cat?

Bobalouy · 12-06-2003, 09:08 AM

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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Legacy777 · 12-06-2003, 11:19 AM

cat efficiency....that's it.

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	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 * Registered users of the site do not see these ads.

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12-06-2003, 11:19 AM	#2
Legacy777 Scooby Guru Member#: 4800 Join Date: Mar 2001 Chapter/Region: TXIC Location: Houston, Tx Vehicle: 1990 Legacy & 97 OBS AWD 5MT EJ22T AWIC Swap	cat efficiency....that's it.