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: Identifying Knock Sensor Connector
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Remove the knock sensor from the cylinder block.

Fig 3: Identifying Knock Sensor
Courtesy of SUBARU OF AMERICA, INC.