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My question was about an 02 sensor in a 98 Chevy Tracker. We had an 02 sensor replaced but it failed the emissions test and the paper work said that it was the heat sensor that was supposed to be replaced. My question is, are there more than one sensor and how often do they have to be replaced?

Answers from the Automotive Experts

Lori Johnson, Owner and Instructor at Ladies Start Your Engines Dear Tamara, If your vehicle failed for emissions, then there is probably a check engine light on. The technician should use a scan tool to read the code that has been set and then diagnose the problem. If the code read that the 02 sensor was not operating properly and they replaced it, but you still have a problem...it may be something else. The check engine light lets you know there is a code, but proper diagnosis must be made or the problem will re-occur. I would suggest that you take your vehicle to a dealership or ASE certified shop to get a proper diagnosis. Many times there are more than one 02 sensors on the vehicle, one that's upstream and one that's downstream. Someone with good diagnostic skills should be able to fix this problem, not just replace parts. Good luck. Lori Johnson

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