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darrell king

darrel ... 11/11/2012

2006 Nissan Maxima SL 6 Cyl 3.5L

Engine

i got a code po420 what ds this mean and should this be fix

1 Answer


CVO

CVO 11/11/2012

Trouble Code: P0420


Catalyst Efficiency Below Normal (Bank 1)

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
Catalytic converter is damaged, contaminated or has failed
Front HO2S or rear HO2S is contaminated with fuel or moisture
Front HO2S and/or the rear HO2S is loose in the mounting hole
Front HO2S older (aged) than the rear HO2S (HO2S is lazy)

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