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what could cause my catalytic to go bad on 1997 Lexus LS400

code PO431 PO420 PO430

Asked by for the 1997 Lexus LS400
old age or fuel issues.
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1 more answer
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).