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

code PO431 PO420 PO430

by in Tampa, FL on March 11, 2013
2 answers
ANSWER by , March 11, 2013
old age or fuel issues.
ANSWER by , March 11, 2013
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).