Code PO133

Tiny
MICHEBRU
  • MEMBER
  • 2005 CHEVROLET OPTRA
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Have a code po133. I want to know which one the top or bottom?
Thursday, August 2nd, 2018 AT 2:33 PM

1 Reply

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

That would be Bank 1 Sensor 1 (Upstream-Top). I have attached a picture of location (circled in red) and also a link showing how to replace. Hope this helps and feel free to ask any other questions if needed. Thanks for using 2CarPros.
Danny-

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor
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Thursday, August 2nd, 2018 AT 4:36 PM

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