P0420 is my cat bad?

KYMART

MEMBER
2006 NISSAN FRONTIER
6 CYL
4WD
MANUAL
150,000 MILES

Hello, I need to put two new catalytic converters on my truck? I believe the codes were P0420 and P0430. There were no other codes displayed. What could this code be referring to on a gasoline engine?

Thanks

Tuesday, June 10th, 2014 AT 8:26 AM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
47,662 POSTS

Hello,

Yes this code means your catalytic converter is weak and cannot converter the un-burnt fuel to burn fuel. Here are a couple of guides that will help you get the problem fixed.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

and

https://www.2carpros.com/articles/catalytic-converter-replacement

Please let us know what happens.

Cheers, Ken