its under the air intake. its hard to miss. you dont have to take the intake off to see it either. And i believe its a 10mm bolt, simple. Go to http://www.lovehorsepower.com/SubaruDocs/subaru_legacy_knock_sensor.htm there you will find photos on how to remove and reinstall the knock sensor
Remove the intercooler first. The knock sensor is located under its loation. But you will have to remove some breather pipes to get to it. You will need a long ratchet.
Where is the knock sensor located on a 1999 Subaru Forester?
Under the intake arch on the left side of the engine.
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.
can anyone help me please Its the sensor directly under the intercooler remove the intercooler and a couple of airpipes and you will get at it easiar.
You can find the knock sensor on the top side of the engine under the intake manifold. It is easiest to find from the driver's side and is at the back of the engine block.
Under the intake manifold.
that the knock sensor does
It is located on the engine block drivers side.
It is located on the top of the engine, below the throttle. Get a light and look straight down between the two throttle cables "if it has cruise control". It is bolted down with one 12mm bolt.
If somebody knocks on the front door of the Subaru, the KNOCK sensor, sets off the KNOCK Alarm....LOL
In a 1998 Subaru Legacy, the knock sensor is located on the top of the engine block and to the left of the engine. More specifically, it is under the left rear intake manifold runner.