CEL Code P0420
01-19-2010, 06:42 PM
#1
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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? 
01-20-2010, 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?
01-20-2010, 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
