To ensure reliability, purchase GM part # 12597878 Sensor Assembly, Heated Oxygen (Position 1). It is sometimes referred to as GM Oxygen Sensor. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Buick Allure, LaCrosse, Lucerne models. It fits Chevrolet Uplander. It also fits Pontiac Grand Prix, Montana. This also fits Saturn Relay.
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