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1997 Lexus LS400 Question: what could cause my catalytic to go bad

 

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J1114, Tampa, FL, March 11, 2013, 08:56
 Rookie

code PO431 PO420 PO430

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  • Answer #1

    Greg's Orange Auto (14224 Answers) , Orange, CA - (714) 361-9386
    globalhelper March 11, 2013, 13:04
     Master

    old age or fuel issues.

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  • Answer #2

    March 11, 2013, 23:34
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    age and fuel issues. today's fuel uses more ethanol. residues cause clog's in fuel system's and exhaust system's. try fuel additive(specificly ethanol treatment).

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