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Code 27 Sub-oxygen sensor

Tiny
LPORZIO
  • MEMBER
  • 1992 LEXUS ES 300
  • 6 CYL
  • AUTOMATIC
  • 150,000 MILES
I just bought the car went to have it smogged It runs great motor looks like new, but it did not pass the emissions. Gross polluter. I pulled the code myself it's 27 sub oxygen sensor that's the only code. So should I change the oxygen sensor that's after the catalytic converter? Will that fix it or could it be the catalytic converter itself?
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Wednesday, June 3rd, 2020 AT 9:04 PM

1 Reply

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

I've attached diagnostic steps below for Code 27. Here is a tutorial showing what's involved in an 02 sensor replacement:

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Hope this helps and thanks for using 2CarPros.
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Thursday, June 4th, 2020 AT 2:18 AM

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