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It depends on what engine you have. If you have the 2.0L you can get to the sensor from the engine bay. Its on the back side of the engine below the intake. To unhook the wiring you have to jack up the car on the pass. side and unscrew the two nuts that holds up the black plastic cover the houses the conections for both sensors.

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Q: How do you replace the main upstream sensor on a 2001 VW jetta?
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