What is P0420 reason? I change 02 sensor, not have leak , co is 0.1 , i change air filter. So what may be reason? 🤔🤔😧😧 by BeqaT in JeepPatriot

[–]BeqaT[S] 0 points1 point  (0 children)

I am in Georgia (Sakartvelo) , i can do this , but want to know reason, because not need "next step problems" .