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18/06/2023 1:13 am
Topic starter
2004 Suburban throwing code P0420 and P0430.. I saw your video with adding a gallon of lacquer thinner to gas tank might make a difference.
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18/06/2023 1:39 am
Please try the FAQ and see if that helps
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18/06/2023 2:08 am
Most likely it is the cats. But best to do some testing to verify.
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