Quote Originally Posted by Reptile View Post
I'm running into this issue with a friend with an '03....I'm gonna see if this helps he mpg's out.

Thanks for the info!

As far as I know, HP Tuners software does NOT have this ability yet (if that's what you are using). All they allow you to disable is the COT (cat over temp) diagnostic which is NOT the same thing as this cat diagnostic I am talking about.