To ensure reliability, purchase GM part # 12643707 Sensor Assembly, Heated Oxygen (Pre, Catalyst B2S1). It is sometimes referred to as Chevrolet 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 Chevrolet Blazer, Impala, Silverado models.
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