To ensure reliability, purchase GM part # 12591312 Sensor Assembly, Knock. It is sometimes referred to as Chevrolet Knock 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 Express, P30, Silverado models.
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