P0420 CEL 99 civic si

[Bruce Leroy]

Correct even a small hole that the human eye cant see can trigger this code

PO420 Means You need a cat, it will still run 100% but in order to pass emissons and get the light off you will need it replaced!

CORRECT.... I was replacing O2 sensors and other bs, Listening to my dads "Mechanic"... Trust the obdII

[preferredduck]

CORRECT.... I was replacing O2 sensors and other bs, Listening to my dads "Mechanic"... Trust the obdII

thanks for the breakdown b/c i don't like chasing sensors and b/c the car has been boosted, ran lean, out of time etc i think it's going bad but not there just yet, but when i sell my cylinder head thats what i'll get. the ebay link does not work but i found a few others for honda's