HondaCivicForum.com

HondaCivicForum.com (https://www.hondacivicforum.com/forum/)
-   Mechanical Problems & Technical Chat (https://www.hondacivicforum.com/forum/mechanical-problems-technical-chat-8/)
-   -   code po 420 Cat efficiency (https://www.hondacivicforum.com/forum/mechanical-problems-technical-chat-8/code-po-420-cat-efficiency-83825/)

fatbagger Jul 1, 2010 06:03 AM

code po 420 Cat efficiency
 
I have an 03 civic 1.7 code po 420 cat efficiency?? Help

RonJ Jul 1, 2010 07:16 AM

This code generally means that the catalytic converter is toast. Any other CEL codes? Is the engine misfiring?

fatbagger Jul 2, 2010 05:01 AM

Thanks Ron
 
Yes it had an intermitant missfire which was caused by the cam position sensor which I have replaced! Since then the Engine has run great! just keeps setting the 420 code occaisionally

RonJ Jul 2, 2010 06:51 AM

Unfortunately, the misfire problem that you have now fixed permanently damaged the cat.


All times are GMT -8. The time now is 05:46 AM.


© 2026 MH Sub I, LLC dba Internet Brands