1999 Chevrolet Lumina General Question

Please tell me the location(s) of the oxygen sensor(s) and give me any clues as to which one, if any, is giving me the "Service Engine Soon Light". The light has been constant for several months. I haven't noticed any difference in performance, except perhaps lower gas mileage. Your help is greatly appreciated, especially since I am hoping to fix the problem at minimal expense before the annual state inspection is due. Thanks again. Regards, Frank Best of luck! Michelle Wingard

Posted Jan 1st by Frank the owner of a Chevrolet Lumina Chevrolet, Lumina, Check Engine, Gas Milage

Answers from the Automotive Experts

Dear Frank, There are 2 sensors on your vehicle. One is on the exhaust manifold on the right side of the engine, and the other is on the exhaust pipe behind the catalytic converter. Without using a scan tool, it would be hard to tell which one is causing the problem. With O2 sensors it's important to have a certified technician diagnose this problem. Some times the O2 sensors are really bad, and other times there is another problem that's causing the O2 sensor to give a bad reading and can cause your check engine light to come on. You certainly don't want to replace the sensor if there is another problem, otherwise your new sensor will go bad as well. I would recommend having a shop or dealership look at this problem. Good Luck. Lori Johnson

⟩ Answered on Jan 1st, 2008 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines

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