check engine light on?
How to clean p0420 low efficiency without replacing Cadillac converter
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the chech engine light is on
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They sell so stuff on Amazon that cleans Cats and O2 sensors, 2 cans for $30. You can always pull the O2 sensors out (probably lots of PB Blaster and maybe a busted knuckle depending on where they are located) then hit them with some carb cleaner till they sparkle.
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