Honda Accord Forum - Honda Accord Enthusiast Forums - 67.............P0420.............................. ...............Catalyst system efficiency below t

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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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