Catalytic converter replacement instructions

Tiny
RWETMORE71
  • MEMBER
  • 2013 HYUNDAI SANTA FE
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 38,000 MILES
Code came back as P0420.
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Thursday, February 11th, 2021 AT 12:15 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

This vehicle has one, three way catalytic converter. It is under the vehicle. I attached a pic below.

Let me know what is happening or if you have other questions.

Take care and God Bless,

Joe
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Thursday, February 11th, 2021 AT 5:41 PM
Tiny
RWETMORE71
  • MEMBER
The check engine light came on, had it checked at the dealer had the p0420 code returned. The dealer indicated they checked everything and the catalytic converter had to be replaced.

I had one ordered through a mechanic and had it installed. 2 days later, the check engine light came back on. I had the code read and again came back at p0420.

What could be causing this?
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Thursday, February 11th, 2021 AT 5:49 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

They should be doing this under warranty, correct? It's possible that it's bad again, but not common.

If you want to try it yourself, it isn't hard to do.

1) Allow the vehicle to fully cool off.
2) On a level surface, safely lift and support the vehicle.
3) Unbolt the flange bolts from the rear of the exhaust manifold and the opposite end where it bolts to the muffler.
4) Disconnect the oxygen sensor and remove the converter and pipe.

_________________________________

You may want to do this and check the wiring at the oxygen sensor. Do you know if they replaced the sensor when the new converter was installed?

Let me know.
Joe
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Thursday, February 11th, 2021 AT 6:19 PM
Tiny
RWETMORE71
  • MEMBER
No, it's not under warranty. No sensors were replaced. Dealership said they checked them and they were good.
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Thursday, February 11th, 2021 AT 6:37 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
If the sensors are good, the catalytic converter is good, then it has to be a wiring issue or a problem with the powertrain control module. Have they re-inspected the converter?

Here is a link that explains how to check wiring. I'm adding it in case you want to check what's there. Even a loose connection at the O2 sensor can be causing this.

https://www.2carpros.com/articles/how-to-check-wiring

Let me know.

Joe
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Thursday, February 11th, 2021 AT 6:43 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

I was wondering how you made out with the issue. Also, I wanted to attach the powertrain management wiring schematics for you. I'm not sure how involved you got into the wiring.

There are five pics below. They are in order, so hopefully, they will help.

Let me know how things are going or if you have other questions.

Take care and God Bless,

Joe
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Monday, February 15th, 2021 AT 2:43 PM

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