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How do I fix trouble code P0420

  

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Hi, I have a 03 camery with 217k miles on it and the only code it has is p0420 for the cat  any easier way I can fix that besides replacing it.  If I do have to replace it wondering how much would it cost. Thanks


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Please search the forum for other answers. You're the third person so far just today to ask the exact same question. Also it's covered in the FAQ.


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