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Mike V.
Mike V., Hyundai Technician
Category: Hyundai
Satisfied Customers: 23633
Experience:  I have over 25 yrs. experience on all makes and models. Factory trained for Subaru and Nissan.
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Hyundai Elantra: 03 Hyundai Elantra fault code P0420. This

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'03 Hyundai Elantra fault code P0420. This code comes up on my scanner as Catalytic Converter below threshold, Bank one. This car has two catalytic converters. How do I determine which one is bad? Or is that what the "Bank One" annotation is all about. The flex pipe, which has a converter on it, was replaced about a year ago. These suckers are expensive and I don't want to chase my tail.
Hi there!
This code if for the first converter right off the exhaust manifold.
The converter behind the flex pipe isn't monitored by the O2 sensors and can't throw the code.
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