Hey Scotty, I have 99 Toyota Avalon and the check engine light is on with P0420 code. I watched your video about putting lacquer thinner in the gas tank to try and fix it, I saw other videos and read that it can damage the fuel pump and or fuel lines. What do you think before I do it, because it’s my only car and can’t afford to get another one. Thanks hope you can help.

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Do as you please, but mixed with 9 gallons of gas in the tank, one gallon of lacquer thinner hurts nothing