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The knock sensor is under the intake manifold.Replacement of it requires an experienced mechanic.But first, do a diagnostic check before condemning it. This requires checking for voltage fluctuations with a voltmeter hooked up to the knock sensor sub-harness electrical connector. The sensor signal uses a white wire usually- the terminal is located to the immediate right from the upper left corner terminal on the 1997 model. You tap the intake manifold with a hammer and observe voltage fluctuations (this tap simulates knock from the engine). If no voltage fluctuations are observed, the sensor is bad. But if you do observe fluctuation, your knock problem is elsewhere.
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Q: Where is the knock sensor on a 1997 Mercury Villager?
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