Can You Clean Your Catalytic Converter to Fix a P0420 Code? | The Fixit shed

UPDATE: This does NOT appear to have worked for me, as my check engine light came back on.  I will update more when I have more information.

I have a check engine light on my Toyota Matrix (Code P0420).  Before I spend over $1000 to replace the catalytic converters (it has 2), I want to see if there is a way to remedy the problem less expensively.  Scotty Kilmer has put up a controversial video about using Lacquer Thinner mixed into your gas to clean the catalytic converter.  I trust his years of experience as a mechanic, so I am going to give it a try.  If the catalytic converter is worn out or damaged, this won't help, but if it is just dirty, this may do the trick and get the light to go out.

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