To ensure reliability, purchase GM part # 12609456 Sensor Assembly, Heated Oxygen (Position 3). It is sometimes referred to as Hummer 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 Hummer H2 models.
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