Question about 2002 Nissan Altima

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2002 nissan altima 4 cyl

I have a code PO 420 CAN YOU HELP ME FIX THE PROBLEM

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  • 4harper Oct 11, 2008

    Ialso have a code PO300

  • RoperDan Apr 23, 2009

    I have had a P0300 Code for over a year now. I have replaced the Spark Plugs, Ignition Coils, 2 Oxygen Sensors, the Catalytic Converter, 2 Cam Sensors and constantly use Additech in the gas to decarb the engine. The car runs well most of the time but sometimes on idle it's a little rough until it warms up. It's driving me nuts, my mechanic gave up and Nissan keeps telling me to bring it back in for more testing at $93 a pop. Can you help?

  • fresh462k Apr 25, 2009

    i keep getting code po420..ive changed the oxygen sensors the sparkplugs and the same code keeps poping out...help anyone please

  • keith g laufenberg Sep 21, 2013

    I have a 2002 nissan altima and have replaced the cam and crank sensors, the alternator, battery, fuel pump, catalytic converter, valve cover gasket, spark plugs and one coil and it STILL has the hardest time starting of any car I ever owned such that my wife refuses to drive it. I'm going to get rid of it soon because I have a 1998 camry with 160,000 miles on it that dtsrts and stops in any conditions and uses no oil and I can no longer afford fixing this altima.

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  • Master
  • 360 Answers

This is a evap code. it needs to be diagnosed. it could be a bad gas cap try that first and clear the codes

Posted on Oct 10, 2008

  • Jimmy
    Jimmy Oct 11, 2008

    random cylinder misfire....... check for a tune up "sparkplugs wires ect "

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  • Nissan Master
  • 705 Answers

You need a new catalytic convertor. Its covered under factory warantee for 8 years or 80000 miles.

Posted on Oct 13, 2008

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1 Answer

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