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. Refer to REMOVAL , Intercooler.
Disconnect the knock sensor connector.

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

Fig 3: Locating Knock Sensor From Cylinder Block
Courtesy of SUBARU OF AMERICA, INC.