Is it the secondary O2 sensor in the cat? I was lucky that this CEL showed up on the way to the H-T meet in Nashville. I wasn't there 5 minutes until I found someone to help me short the plug and count the flashes.

BTW to the Nashville organizers. It was sunny while I was there.

 

Do you have a test pipe or high flow cat?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fredtoast &raquo;</TD></TR><TR><TD CLASS="quote">Is it the secondary O2 sensor in the cat?</TD></TR></TABLE>

Yes.

"Catalyst system Efficiency Below Threshold malfunctioning or defective catalyst system"

 

Thanks guys. H-T RULES! I still have my stock cat (75K miles), but I've had my supercharger for almost 30K miles and running very rich. I've heard that this will ruin a cat.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fredtoast &raquo;</TD></TR><TR><TD CLASS="quote">Thanks guys. H-T RULES! I still have my stock cat (75K miles), but I've had my supercharger for almost 30K miles and running very rich. I've heard that this will ruin a cat.</TD></TR></TABLE>

yes it will. don't worry about the code tho, it doesn't change anything minus the light being on.