To ensure reliability, purchase GM part # 21024981 Knock Sensor. It is sometimes referred to as Chevrolet Crankshaft Position Sensor, 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 Blazer, S10, Silverado models.
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