Question

how to fix P0420 code on a 2008 Chevrolet Aveo?

Answer 1

P0420 Catalyst sytem below threshold, How to fix it several ways,What this code mean it worn out, Inside the catalytic is pladdium and rhodium, How a catalytic works is that it need a engine 02 sensor that can go from lean to rich,this is how it control emission when the catalyst is below threshold its usually worn out, Now there are ways to bring it back to life this may be something you might be interested yet I havent tried it, In Asia and Europe they remove catalytic and clean it in laundry soap,by letting it soak, There has been success report from scotty kilmer on u tube where adding paint thinner to the fuel tank brings it back to life,Or even using better gas. either way your cats worn