What should I do to fix a check engine light has turn on?
What is your question?
By mistake I filled up the 1/2 of tank of diesel super gas and after that the check engine light turn on. After I used a check engine device to find out the problem it shows a troubleshooting codes : PO420 Catalyst system efficiency below threshold- bank 1 probable cause aa1.- Air leak in exhaust before rear HO2S (Heated Oxygen sensor) Bank 1 aa2 AF sensor error aa3 Fuel system fault aa4 Faulty catalytic converter. Should I flush out the gas from the tank so the oxygen sensor it will reset by itself or should change the catalytic converter as well I don't know what to do. Thanks for your help.
RepairPal Certified shops can diagnose and repair your 1996 Toyota Camry. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
The first thing to do is get all of that diesel out of the tank and the fuel lines, then fill it with gasoline.
Once that is done, then I would try erasing the codes and driving the vehicle to see what codes re-appear then address those codes.
