To ensure reliability, purchase GM part # 21024981 Knock Sensor. It is sometimes referred to as GM Crankshaft Position Sensor, GM 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 Cadillac Deville, Eldorado, Seville models. It fits Chevrolet Blazer, S10, Silverado. It also fits GMC Savana, Sierra, Sonoma. This also fits Saturn SC1, SC2, SW2.
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