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Catalyst monitoring

Tiny
SAMI1064
  • MEMBER
  • 2008 INFINITI G35
  • 1,660,003 MILES
My scanner is showing me this on the catalyst monitoring section:
Lean to rich sensor (v)
Meas:5
Min:25
Max:255
Sts:fail
I would like to know if this is a bad cat or o2 sensor?
Monday, February 21st, 2022 AT 6:19 PM

6 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Do you have a code that is set?

You determine a bad cat by the reading on the rear O2 sensor. Can you give me that reading?

Roy
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Tuesday, February 22nd, 2022 AT 6:41 AM
Tiny
SAMI1064
  • MEMBER
  • 11 POSTS
Hello,

Yes, I sure do. It’s p0420. I also smell gas when I turn on the heater, and for the o2 sensor. I have to double check. I have a cheap scanner so hopefully it gives me a reading. I will let you know ASAP.
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Thursday, February 24th, 2022 AT 3:26 PM
Tiny
SAMI1064
  • MEMBER
  • 11 POSTS
The reading for o2S12 was 0.290.
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Thursday, February 24th, 2022 AT 4:26 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
This sensor should read around.550 constantly and not vary. If it varies, then the cat is bad and needs to be replaced.

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

Roy
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Friday, February 25th, 2022 AT 12:03 AM
Tiny
SAMI1064
  • MEMBER
  • 11 POSTS
I went today to a shop and was told the catalytic converter at the manifold right side needed to be replaced. I also hear a pressure sound almost like a high-pressure gas gets released from the exhaust area. I saw the muffler was leaking water as well.
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Friday, February 25th, 2022 AT 2:47 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
As I stated before, you need a new catalytic converter.

Roy
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Saturday, February 26th, 2022 AT 2:28 AM

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