The knocking sound that the sensor is designed to detect is caused by uneven combustion of a lower octane gasoline than the engine is able to burn efficiently. The knock sensor signals the Electronic Control Unit and ignition timing and other engine parameters are changed to eliminate the knocking. Knocking, if allowed to continue over a long time can seriously damage the engine. --Ken
Where is the knock sensor located on a 1999 Subaru Forester?
The knock sensor is located near the idle air control solenoid valve on a 2001 Subaru Forester. The knock sensor is responsible for sensing vibrations caused by engine knock.
If somebody knocks on the front door of the Subaru, the KNOCK sensor, sets off the KNOCK Alarm....LOL
Knock sensor/vibration sensor
Yes.
Not necessarily.
Could be a bad knock sensor. The ECM may be retarding the timing based on bad input from a faulty knock sensor.
It will sense the engine pre-detonating fuel(usual cause is fuel octane level to low). ECU will adjust timing to prevent damage to engine.
that the knock sensor does
P0328 on an OBD11 equipped automobile (everything since 1996) is a knock sensor code. I believe that it says the reading is over the high limit. You should focus on the knock sensor and the wiring leading to it. --Ken
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
The knock sensor is just behind the intake manifold on the top of the engine. It is a few inches below the manifold and all you will see is a bolt with what looks like a very thick washer on it with wires coming out of it. The knock sensor appearance has been described as a small donut. Easiest to see while leaning over the left front fender using a flashlight.