RH Side

Remove the collector cover.
1. Remove the clip (A).
2. Hold the shaded area (B) by hand and carefully pull the RH side (C) upward.
3. Hold the shaded area (D) by hand and carefully pull the LH side (E) upward.(E)
Fig 1: Removing Collector Cover (RH Side)
Courtesy of SUBARU OF AMERICA, INC.
Disconnect the ground cable from battery.
Remove the intake manifold. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC) > Intake Manifold > REMOVAL .
Remove the fuel pipe insulator No. 3. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC) > Fuel Insulator > FUEL PIPE INSULATOR NO. 3 .
Disconnect the connector (A) from the knock sensor, and remove the knock sensor from the cylinder block.

Fig 2: Identifying Knock Sensor Connector With Bolt (RH Side)

Courtesy of SUBARU OF AMERICA, INC.