Question about 2001 Volkswagen Golf

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I have a 2001 VW golf that I just bought. It passed smog checks no problem. But now the Engine Light is "ON" and the guy at the shop told me that the code is 420. What is code 420?

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How can i fix the the catalyst system efficiency below threshold cylinder bank no.1 on a 2001 volkswagen turvo

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If the code is p0420
it means
catalyst system efficiency below threshold
(cylinder bank no.1)

Posted on Aug 21, 2010

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