To ensure reliability, purchase GM part # 19178930 Sensor Asm,Heated Oxygen. It is sometimes referred to as Buick 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 Century, Lesabre, Regal models.
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