Code P0420?

Tiny
CHRISTOPHER LOPEZ2
  • MEMBER
  • 2017 HYUNDAI ELANTRA
  • 1.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 116,000 MILES
Yes, I hooked up my OBD2 to my car and a code P0420 came up. What should I do about that?
Wednesday, December 14th, 2022 AT 3:00 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,861 POSTS
The P0420 code means the catalyst system efficiency below threshold (Bank 1). So, this means the catalytic converter could be worn out or if the throttle has been wide open too long it will cause this code as well. I would clear the code and drive the car normally to see if it comes back. If it does here is a generic guide to help walk you through the catalytic converter replacement with instructions for your car in the diagrams below:

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

The catalytic converter is part of the exhaust manifold on your car. Check out the images (below). Please let us know what happens.
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Thursday, December 15th, 2022 AT 2:02 PM

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