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On an 04 Santa Fe what does the engine code P0421 mean?

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

Vehicle: 2004 Hyundai Santa Fe 2.4L 5 speed
asked Jun 24, 2014 by Anthony

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 Jan 22, 2016 by Carguy1 (7,352 points)

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