i have 1998 chevy z71,5.7.my scan tool shows PO420.catalyst system effiency below threshold (BANK ONE).ANYBODY TELL ME WHAT I NEED TO DO TO FIX IT ,OR TELL ME WHAT SITE I CAN GO TO TO FIND OUT.THANKS
i have 1998 chevy z71,5.7.my scan tool shows PO420.catalyst system effiency below threshold (BANK ONE).ANYBODY TELL ME WHAT I NEED TO DO TO FIX IT ,OR TELL ME WHAT SITE I CAN GO TO TO FIND OUT.THANKS
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