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Wondering what the code P0421 means and how do I fix it?

Vehicle: 2004 Hyundai Santa Fe 2.4L 5 speed
asked by

1 Answer

Hi there,

This code means the pre catalyst is not performing properly. To repair it you will need to replace the converter that is right off the exhaust manifold. The one between the 2 O2 sensors on the exhaust system.
answered by (8.1k points)

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