SPONSORED LINKS

Service engine light on Code PO420 catalyst system efficienc

Tiny
STEVERIX
  • MEMBER
  • 1942 CHEVROLET LUMINA
My 1997 chevy Lumina 3.1 engine Won't pass e check. Code PO420. Catalyst system efficiency below threshold. Bank 1. Is this somekind of sensor? What needs to done to repair this problem and is it costly? How hard will this be to repair? It has 112K miles. Thank you very much
SPONSORED LINKS
Thursday, November 8th, 2007 AT 8:47 PM

1 Reply

Tiny
DENNYP
  • MECHANIC
  • 1,823 POSTS
Sounds like you could possibly have a restricted or damaged catalytic converter.A quick check is to give it a couple whacks with the heel of your hand and listen for a rattle noise in it.(Make sure the converter isn't hot) Also, check to make sure you have exhaust flow from the tailpipe.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, November 9th, 2007 AT 9:27 PM

Please login or register to post a reply.

Related Check Engine Light Content

Code Read Retrieval/Clear Chevrolet
VIDEO
Code Read Retrieval/Clear Chevrolet
Instructional repair video
Check Engine Light
GUIDE
Check Engine Light
Why is my check engine or service engine soon turned on? In this guide we talk about what this is associated with this notorious light, what it is used for and what you...
VIEW MORE

Sponsored links