A knock sensor sends a voltage signal to regulate ignition timing. In a Jetta, it is typically located under the air intake manifold.
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The idle speed sensor tells the onboard computer how fast your engine is idling. The location of the idle speed sensor on the VW Jetta is on the actual throttle body.
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The oxygen sensor on a 2004 Volkswagen Jetta is located in the engine area. It is usually encouraged to warm up the engine so as to ease the threads.
It will be on top of the transmission near the shift linkage. It is the sensor with the three wires connected to it.
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In the exhaust manifold.
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just curios as to where a knock sensor would b located on a 95 vw golf gti 2.0
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Crankshaft Position Sensor (CKP Sensor)
Below windscreen in middle.