@marconunez4338

P0 420 code can be 1 or 2 issues most of the time. The oxygen sensor between the engine and the sensor (dirty or bad) is the most common cause. Any other causes really can only be spotted by someone qualified. But please don't start buying and replacing parts. It's less expensive to take it in for service.

@DTCcodes

l➤ DTC Code Finder: https://codigosobd2.com/
l➤ Find the Diagram of your vehicle here: https://www.diagramasautomotrices.com/

Leave any questions in the comments and we will gladly clarify them for you.

@jeffoakes4141

Would a new header not tuned trip the code

@murphyzlaw13

Pretty sure good luck finding leaded fuel, unless you work on the flightline. This AI video is dumb, sorry, my opinion

@denisequalls905

Well I have two catalytic converter   and both 02 sensors and I still have the code p0420 I can't even pass my car inspection, I don't know what else to do.

@Spiderman-tg9ke

Cataclean fixed my problem 😊No more check engine light 😊😊

@anthonyhuynh4002

Talking too much without concrete solution.????

@josephmunoz209

So basically replace a ton of shyt

@daphrampa

I have 3 different questions/scenarios I'm curious to know the answer to. 

¹ What if I replace my cat converter completely. Will it rectify any other issues and get rid of the code?
² if I use the duralube severe treatment, but my check engine light is still on, does that mean or didn't work?
³ what's the cheapest and simplest possible solution to clear the code?