2004 Hyundai Santa Fe Logo
Rosy Medina Posted on Nov 27, 2012
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Check Engine light came on on my 2004 Hyundai Santa Fe

About a lil over a week ago my check engine light came on. I took it to get checked at a Auto Zone and the code was #P0431. I thinks its my gas cap but the Check engine light is still on even after a lil over a week now????? Worried

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David Payne

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  • Hyundai Master 14,162 Answers
  • Posted on Nov 21, 2014
David Payne
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WHEN IN DOUBT TAKE IT TO A DEALERSHIP

Thomas Perkins

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  • Hyundai Master 15,088 Answers
  • Posted on Nov 27, 2012
Thomas Perkins
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Trouble Code: P0431

Warm up Catalyst Efficiency Below Normal (Bank 2)

Possible Causes:


Air leaks at the exhaust manifold or in the exhaust pipes.Catalytic converter is contaminated, damaged or has failed.Front HO2S is older (aged) than the rear HO2S (HO2S is lazy).Front HO2S or rear HO2S is contaminated with fuel or moisture.

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Hope this is of some help.
Ed
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I have a book for the Sante Fe, and that code is not in it. I would go back to them and have them re-run it. The person may have just misread the screen.
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