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The knock sensor is located on the rear of the engine (fire wall) above the oil filter, towards the middle of the block. It has a plastic connector with one single wire in it and has a brass hex base. It's mounted at about a 30 degree angle to the vertical block face and is accessible from underneath the car.

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Q: Where is the spark knock sensor on a 2000 Saturn SL2 with 1.9L?
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