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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A knock sensor sends a voltage signal to regulate ignition timing. In a Jetta, it is typically located under the air intake manifold.
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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The airbag sensor is placed at a number of positions in VW Golf TDI. It can be found in the steering, glove compartment, and the main unit placed under the hood.
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Crankshaft Position Sensor (CKP Sensor)
Below windscreen in middle.