Dang Catcos!!!!!

[99orangecamaro]

Alright ive got a 2.5 in/out catco cat with all 2.5 piping and 2.5in/dual out flowmaster 80 series.....and my check engine light comes on and it always says "catalyst efficiency below threshhold", but itll come on for a few days and then go off. when it does come on i can run a can of B12 Chemtool in my gas and it will go off after bout an hour of driving. Its not all the time its mainly happening when i put regular gas in it, if i put 93 in it then it doesnt come on throughout the entire tank. Could this be an oxygen sensor f***ing up or is it just the cat? the car doesnt run bad when the lights on its just annoying. any help would be greatly appreciated

[slow6]

Re: Dang Catcos!!!!!

so you do have an oxygen sensor after the cat?
you can always get the code deleted, so it never shows again

[99orangecamaro]

Re: Dang Catcos!!!!!

yea there is an oxygen sensor after the cat. i ordered an O2 sim the other day and im sure itll fix the light i just wanna make sure its not something else causing the problem

[99orangecamaro]

Re: Dang Catcos!!!!!

also ive cleared the code a hundred times probly but it comes back eventually after clearing it

[loser]

Re: Dang Catcos!!!!!

p0420? get the sim and it'll more than likely go away.