Check Engine Light -code P0420

David_99T4R

New member
Update- Went to Autozone to run the check engine light code and got the answer P0420.
Air leak in exhaust before rear h20 sensor
AF sensor error
Fuel system fault
Faulty catalytic converter.
What do I do first? The light came on shortly after getting fuel. They had me buy some Seafoam to get rid of the bad gas maybe and then reset the code on next fill up. What would be some signs of the cause?
 
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