To ensure reliability, purchase GM part # 55489474 Sensor Assembly, Htd Oxy(Pre, Catalyst Bank 1 Se. 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 Envision models. It fits Cadillac CT6, XT4, XT5. It also fits Chevrolet Blazer, Equinox. This also fits GMC Acadia, Terrain.
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