how do I find the knock sensor

1999 MERCURY VILLAGER
140,800 MILES • 3.3L • 6 CYL • AUTOMATIC
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VILLAGER60
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I had my vehicle inspection done and was told that I needed to get
an oxygen senor and a knock sensor I replaced the oxygen sensor
but don't know where the knock sensor is or what it looks like can
you help me please
Sep 21, 2014 at 8:39 AM
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