Repair procedures: Removal

Turn the ignition switch OFF and disconnect the battery negative (-) cable.
Drain the engine coolant (Refer to "COOLING SYSTEM " in EM group).
Remove the radiator upper hose (Refer to "COOLING SYSTEM " in EM group).
Disconnect the knock sensor connector (A).

Fig 1: Identifying Knock Sensor Connector
Courtesy of KIA MOTORS AMERICA, INC.
Remove the intake manifold (Refer to "INTAKE AND EXHAUST SYSTEM " in EM group).
Remove the installation bolt (A), and then remove the sensor from the cylinder block.

Fig 2: Identifying Installation Bolt
Courtesy of KIA MOTORS AMERICA, INC.