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Near the spark plug #2
The knock sensor is basically a one inch thick washer with a sensor plug on it. it will be attached to the block with a bolt that just runs through the center of it The knock sensor module is located inside the little cover on the VCM.
The knock sensor on a Passat is located on the side of the engine. It is just below the number two cylinder spark plug.
Couldn't be easier. Once you locate the knock sensor below and behind the intake manifold, it is held on with one screw through the middle and connected to the wiring harness by one plug. Finding it is the hard part. --Ken
I am assuming you have the 2.0L? If so this is a distributor-less engine with coil over plug ignition. The spark signal comes from the crankshaft position sensor.
You have another problem other then the knock sensor if the engine will not start and run. A knock sensor will not cause the engine not to run.
Sometimes they use that threaded drain plug location to attach a knock sensor. So if you see a knock sensor threaded into the side of the block that may be where the coolant drain is located.
remove the sensor, backprobe the plug with a multimeter set on voltage, tap the knock sensor lightly with a spanner, you should see voltage respond by increasing whenever you tap it, this means your knock sensor is working correctly. if it does not move however it means that the sensor is faulty.
.o44 and some are .043.
Nope prob leaking freeze plug
the gap is .025
you unplug the old one. And plug in the new one.