Knock Sensor: Removal

Disconnect the ground cable from battery.

Fig 1: Disconnecting Ground Cable From Battery
Courtesy of SUBARU OF AMERICA, INC.
Remove the clip (A), and loosen the clamps (B) and (C) securing the air intake boot.

Fig 2: Air Intake Boot, Clip And Clamps
Courtesy of SUBARU OF AMERICA, INC.
Remove the air intake boot from the air cleaner case (rear) and throttle body, and move the air intake boot aside so that it does not interfere with the work.

Fig 3: Removing Air Intake Boot From Air Cleaner Case (Rear) And Throttle Body
Courtesy of SUBARU OF AMERICA, INC.
Disconnect the connector (A) from the knock sensor, and remove the knock sensor from the cylinder block.

Fig 4: Identifying Knock Sensor Connector With Bolt

Courtesy of SUBARU OF AMERICA, INC.