Which oxygen sensor tells the catalytic converter needs to be replaced?

1998 MAZDA PROTEGE
236,000 MILES • 1.8L • 4 CYL • 2WD • AUTOMATIC
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MALINA7
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So, which sensor on this vehicle tells the vehicle's computer, (turns on the check engine light) that the catalytic converter needs to be replaced? And where is it located?
Oct 17, 2022 at 4:40 AM
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STRAILER
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This would be oxygen sensor #2 bank 1. here is a guide to help you walk you through the replacement and the location of the sensor for your car in the diagrams below:

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

Check out the images (below). Please let us know if you need anything else to get the problem fixed.

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Oct 17, 2022 at 10:24 AM