Code p0421

2004 HYUNDAI SONATA
203,549 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC
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DARTANIAN BENSON
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  • 1 POST
Trying to find the location of bank one sensor 2 02 sensor.
Oct 31, 2019 at 10:55 AM
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SCGRANTURISMO
  • CERTIFIED EXPERT
  • 4,897 POSTS
Hello,

I have included the information that you requested in the diagrams down below. Direct Trouble Code[DTC] P0421 is a DTC that sets when your Catalytic Converter has used up it's expected life span and needs to be replaced. I have included the directions on how to replace a catalytic converter below in the link.

https://www.2carpros.com/articles/catalytic-converter-replacement

Please go through the guide and get back to us with how everything turns out.

Thanks,
Alex
2CarPros
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Oct 31, 2019 at 1:01 PM