Have a code po133. I want to know which one the top or bottom?
Aug 2, 2018 at 2:33 PM
Code po133
2005 CHEVROLET OPTRA
MICHEBRU
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Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
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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
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
Image (Click to enlarge)
Aug 2, 2018 at 4:36 PM
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