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CEL Code P0420

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Old Jan 19, 2010 | 06:42 PM
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Default CEL Code P0420
hey guys, the other day i scanned my cel light and the code P0420 read and it said catalyst system efficiency below threshold. does anyone know what that means?
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Old Jan 19, 2010 | 09:36 PM
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do you have a test pipe?
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Old Jan 19, 2010 | 11:30 PM
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no stock cat
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Old Jan 20, 2010 | 03:50 PM
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99% your cat is bad, I had the same code on my 06, with 06K miles on it, honda covers it for 8 years or 80000 miles, i am a techinician and see these codes almost every week. What year is your S2000?
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Old Jan 20, 2010 | 03:52 PM
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If you are talking about the 01, probably wont be covered, try getting one off internet, honda will rape you, it cost over 1000 to replace one, lucky me, i didn't have to pay a penny
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Old Jan 20, 2010 | 03:54 PM
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get an oem replacement cat from an aftermarket company..8yr/80k as stated before for cats...
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Old Jan 20, 2010 | 04:00 PM
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Or buy a used cat in the FS forum.
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Old Jan 20, 2010 | 06:01 PM
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thanks for all the replies guys
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Old Jan 20, 2010 | 06:26 PM
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Very slight possibility, but perhaps your O2 sensor has gone bad or needs a cleaning. Might want to just try this before dropping a few hundred dollars for a replacement cat
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Old Jan 20, 2010 | 06:33 PM
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P0420 isn't from a bad 02 sensor... Everyone hopes that an 02 can cause it.. They buy a new sensor and get the same code. Don't waste your time.
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