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sheilabrum
sheilabrum 3/23/2010
2002 Nissan Maxima SE 6Cyl3.5L - Engine
the oxygen sensor codes says p0420 and p0430 bank 1 and bank 2 what oxygen sensor part # do i need
2 Answers
  • Tracey
    Tracey 3/23/2010
    You may not need a new oxygen sensor. P0430 and P0420 codes mean something’s not working as well as it should in the catalytic system. While it could be caused by an oxygen sensor not working properly, it’s more likely something else.

    I recommend you check for an exhaust leak in the manifold, exhaust pipe, or catalytic converter. If you find a leak, fixing it may solve the problem.
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  • tommy
    tommy 6/10/2010

    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)
    Trouble Code: P0430


    Catalyst Efficiency Below Normal (Bank 2)

    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) I hope this helps Tracey.
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