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I just replaced mine last night. Its located in the front right between the grill and the radiator( probably directly inside the hood from where you license plate would go) . we needed a special socket to reach in and remove it . The space is limited when trying to reach down with your hand. This is an edit to the answer above: There are TWO O2 sensors on the car. One (the front one) is located as mentioned above. The rear O2 sensor is located underneath the front passenger side of the car (you will have to jack the car up to replace it).

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Q: Where is the rear o2 sensor located on a 1998 Mercury Mystique 6-Cyl?
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