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

Tiny
MALINA7
  • MEMBER
  • 1998 MAZDA PROTEGE
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 236,000 MILES
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?
Monday, October 17th, 2022 AT 4:40 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
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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Monday, October 17th, 2022 AT 10:24 AM

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