Question about 1996 Jeep Grand Cherokee

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Check engine light on code comes up po420 what is the problem

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  • GRPMAN Sep 18, 2009

    WHAT COULD THE ENGINE CHECK LIGHT MEAN ON A 96 JEEP CHEROKEE?

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If i'm not mistaken i am 85% sure it is the filler neck tube seal at the gas tank..

Posted on Sep 22, 2009

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I believe that is an evap system leak,i cant remember if its large or small,check yur gas cap for damage and make sure its tight

Posted on Sep 05, 2009

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Troubleshooting code PO420


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I have a 2000 chrysler concorde that the engine light just popped on - the error codes are po302, po420, po340


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The Cam sensor most likely needs to be replaced first. Clear the codes after that and drive and see what comes back on.

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1997 toyota camry check engine light on,code po440,po420,po441,


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PO420" Catalyst efficiency low Bank 1"


Replace the catalytic converter.

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1 Answer

CTS CODE PO420


most of the time its the sensor that cause this,id try replacing the sensor on it,that usually fixes that code,but you have to get the code cleared off with a scanner ,and then re-scan it to make sure it doesn't come up again,good luck with it.

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