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The upstream O2 sensor on a 2001 Buick LeSabre is located in the exhaust system, specifically before the catalytic converter and typically mounted on the exhaust manifold or the front pipe. To access it, you may need to raise the vehicle and work underneath, as it is positioned along the exhaust pathway. It usually has a wiring harness connected to it, making it identifiable. Be sure to take necessary safety precautions when working on the vehicle.
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Where is mass air flow sensor for 1997 Buick LeSabre located?
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