The knock sensor is located on left side (drivers side) of the throttle body. Disconnect the connector and then remove the holding the sensor in place. You will need a 12mm socket and long extension to reach the sensor. Positioning the new sensor may be the most difficult part due to an inability to each it effectively but it is possible. Make sure to tighten the bolt to no more than 15 ft-lbs of torque or you could ruin it. Once you have completed this, you should be all set but you may need to reset the computer to clear the check engine light.
i found mine it is on the left side in the back of the engine on top of the trans
four4
In a 1991 Subaru Legacy, the speed sensors can be found on the driver's side of the transmission. They are located towards the rear, and there are three of them.
Under the sea.
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.
top of front of engine, under alternator
Directly below the alternator on the block.
It only involves one bolt and one wire, but its pretty difficult to access as it lives under the throttlebody.
that the knock sensor does
Oxygen sensor on 1990 Subaru Legacy is under car, just behind engine where exhaust manifolds join but before catalytic converter. Wires run up right side of bellhousing and connect into wiring harness.
Its on top of the engine by the fuel injection (remove the air intake first). Need a 10mm socket with a long extention.
on top of the fuel tank