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P0420 on code reader

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Old Apr 29, 2014
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P0420 on code reader
what does catalyst efficiency below threshold, bank 1 actually mean.... honda , civic 2001 ?? can anyone suggest a solution ? thank you
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Old Apr 29, 2014
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Re: P0420 on code reader
It means you need to replace the cat.
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Old Apr 29, 2014
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Re: P0420 on code reader
it's not a question about the site, dude... post on the mechanical problems section...
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