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Persistent P0420

  

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Hi Scotty, im at a loss, i have a 2010 toyota Corolla, automatic, 135,000 miles, runs great! I have a P0420 code that wont go off. I've had the cat changed, the oxygen sensors, the mass air flow sensor, and spark plugs replaced. No vacuum leaks. Hel...

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Your question got cut off because you put it in the wrong place, the length-limited subject line which is intended for a short description. Details belong in the body of your post. You may want to add the missing information as an answer here. (Truncated question moved.)


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