2003 yukon 5.3L p0420

[stilix]

Hope this is in the right section. My check engine light came on yesterday and i got fault code p0420 catalytic converter effiecency. I have about 78,000 miles. Anybody else that has had this issue?

 

[ktmhans]

Hope this is in the right section. My check engine light came on yesterday and i got fault code p0420 catalytic converter effiecency. I have about 78,000 miles. Anybody else that has had this issue?

I found it was cheapest, and fastest to replace the whole y pipe assembly with the magnaflow unit. Solved my light. I never checked my o2 sensors. But i they have been changed in the last 20k. If you search my posts i put a link to where i got mine. It was a smoking price