The knock sensor is located on the rear of the engine (fire wall) above the oil filter, towards the middle of the block. It has a plastic connector with one single wire in it and has a brass hex base. It's mounted at about a 30 degree angle to the vertical block face and is accessible from underneath the car.
Near the spark plug #2
the knock sensor monitors preignition,spark knock and sends signal to pcm,pcm responds by adjusting ignition timing and fuel timing until knock is gone.
The ECM controls the timing with information sent to it from sensors such as the crank sensor and the knock sensor.
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no, it is not.
If somebody knocks on the front door of the Subaru, the KNOCK sensor, sets off the KNOCK Alarm....LOL
the knock sensor is under intake, must remove intake and it is under two coolant lines.
Yes, there are 4.
usually on the side of the engine by the crankshaft. The knock sensor provides the computer the position of the crank shaft to give it the right information to get correct timing. A bad knock sensor will cause it to run ruff or not at all The knock sensor senses spark knock or pinging and sends that info to the ecm. The ecm then in turn retards the timing until the ping stops. You can test the knock sensor with the engine running, with a timing light attached watch the timing marks as you tap the engine block with a small hammer, you will see the timing retard briefly.