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Home >> Subaru >> 2009 >> Impreza WRX, 4D Sedan >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (H4DOTC) >> Knock Sensor >> Removal
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Knock Sensor: Removal

  1. Disconnect the ground cable from battery.
    Fig 1: Identifying Battery Ground Cable
    G05019586Courtesy of SUBARU OF AMERICA, INC.
  2. Remove the intercooler. Refer to REMOVAL , Intercooler.
  3. Disconnect the knock sensor connector.
    Fig 2: Identifying Knock Sensor Connector
    G05660397Courtesy of SUBARU OF AMERICA, INC.
  4. Remove the knock sensor from cylinder block.
Fig 3: Locating Knock Sensor From Cylinder Block And Bolt
G05954815Courtesy of SUBARU OF AMERICA, INC.