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1996 Toyota Land Cruiser Question: my check engine light is on what is the problem?

 

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dowdy, 4.5L 6 Cylinder, Rochester, NY, January 07, 2012, 18:22
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i used a hand held diagnostic machine to check it and the code that came back was PO420. please get back to me asap

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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, January 07, 2012, 19:02
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    P0420 is low catalytic converter efficiency.Could be a bad cat, false O2 sensor readings or have failed due to an out of tune engine/excess fuel or misfire.

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    dowdy, January 07, 2012, 19:14
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    thanks again,what are you suggestion first?

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    January 07, 2012, 22:55
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    Use a scanner that can provide you with rear O2 sensor readings. If you have a smart phone there is a wonderfull new piece of equipment for $99.99 that can provide you with this info. Go to www.plxkiwi.com to see. I really can't believe how good the device is. Of course it comes from silicon valley.
    The truck is 16 years old. You most likely have to replace the cats.

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