Question about 1997 Pontiac Grand Am

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O2 sensors Hi there, I need to change out my O2 sensors on my 97 Grand Am but I don't know where they are. I have been told where they are, but I still can't figure it out. Could someone explain it to me as if I were a complete dummy? Pictures would help as well! Thanks in advance!

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  • gpbadger Jul 31, 2008

    Thanks j_del! You rule! :D



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I don't have pictures, but if you look under the car, find the exhaust system, and specifically the catalytic converters (they should be under the center of the car, most likely about in line with the rear seat). Since your car is a 97, it's got OBD2 emissions compliance, which means you'll have an O2 sensor in front of each cat as well as behind each one. They'll be small cylinders sticking up and out of the pipes about 2 inches, with wires coming off the ends. The forward ones are between the front edge of the cat and the engine, and the rear ones will be just past the cats. They're the only electrical sensors that should be on your exhaust system, so you should be able to pick them out easily enough once you're under there.

Posted on Jul 30, 2008

  • Jeremy Dellow
    Jeremy Dellow Jul 31, 2008

    LOL, glad it helped:) Buzz me back if you have trouble. You should be able to change them yourself with a ratchet and an O2 sensor socket. The socket is specifically for changing O2 sensors, and is identifiable by the slot cut down the side of it (this allows you to remove it without damaging the wires). Just unscrew it from the exhaust, and unplug the connector, and install the new one in the reverse order. You may need to spray the sensor down with PB Blaster (a penetrating lubricant) - spray where it touches the exhaust - it'll get down into the threads and help free them up. This will make life a lot easier when trying to remove them.



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