Knock Sensor: Removal

Remove the collector cover.
Disconnect the ground cable from battery.

Fig 1: Disconnecting Ground Cable From Battery
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Remove the intercooler. < Ref. to REMOVAL , Intercooler. >
Disconnect the knock sensor connector.

Fig 2: Disconnecting Knock Sensor Connector
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Remove the knock sensor from cylinder block.

Fig 3: Removing Knock Sensor From Cylinder Block

Courtesy of SUBARU OF AMERICA, INC.