Knock Sensor: Removal

Disconnect the ground cable from the battery.

Fig 1: Identifying Battery Ground Cable
Courtesy of SUBARU OF AMERICA, INC.
Remove the intercooler. Ref. to REMOVAL , Intercooler.
Remove the intake manifold. Ref. to REMOVAL , Intake Manifold.
Remove the secondary air combination valve RH. Ref. to REMOVAL , Secondary Air Combination Valve.
Remove the knock sensor from the cylinder block.

Fig 2: Locating Knock Sensor
Courtesy of SUBARU OF AMERICA, INC.