Honda Accord Forum - Honda Accord Enthusiast Forums

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-   -   67.............P0420.............................. ...............Catalyst system efficiency below t (https://www.hondaaccordforum.com/forum/general-tech-help-7/67-p0420-catalyst-system-efficiency-below-t-6263/)

Mr Herpes Dec 3, 2006 06:17 PM

67.............P0420.............................. ...............Catalyst system efficiency below t
 
ok, I have a 99 Accord V6 and this code keeps coming back even though I have replaced the CAT 3 times now, I had the "thorough" diagnostics test done and they said every thing was fine, I'm starting to think that Voodoo has been done to my car...

hondadude Dec 4, 2006 12:03 AM

RE: 67.............P0420.............................. ...............Catalyst system efficiency below t
 
Aftermarket Cat? What were the secondary O2 sensor readings at 2000 RPM from the "thorough" diagnostic?


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