got a P0420 code check engine light. Just want to know from your experience which part was actually fixed to address this issue. Thanks

 

front bank 1 catalytic converter, buy an after market with new o2 sensors , that shoudl fix the problem. u should change it soon becasue i didnt change it for 2 years and then my car started to burn oil becuase of the carbon biuld up

 

Try this first. It worked for me and I do it twice a year. 210,000 miles and still going strong. Not to mention much cheaper.

https://www.youtube.com/watch?v=5icTmYItwiE