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2001 Hyundai Santa Fe - Code P0421 Help!?

Source: Yahoo! Answers

I have an 01 Hyundai Santa Fe 2WD 4Cyl and have been having issues with this stupid code (P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1) ) for a while. At first we fixed one of the catalytic converters, but the light came back on. Then we fixed the muffler (we... Read More

  • What do you mean by 'fix the converter'? A crack you tried to epoxy or weld? Did you hollow it out, thinking it was plugged? Unfortunately, the best option for defective converters is to replace them. Fixes usually don't fix anything at all in these instances. And the exterior is cast iron, so a really good welder is... Read More
  • I answered your question before that if there were any exhaust leaks that it would set that code3. A cracked manifold is considered an exhaust leak. Replace the manifold for the leak and your problem should be remedied. Reference:hyundai platinum tech 8 yrs
  • Fix the crack. The code is set off by the introduction of fresh air from the crack.

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