Knock Sensor: Removal

Disconnect the negative battery cable.
Remove the upper intake manifold, (Refer INTAKE MANIFOLD )
Disconnect the electrical connector (Fig 1).

Fig 1: Disconnecting Knock Sensor Connector
Courtesy of DAIMLERCHRYSLER CORP.
Remove the knock sensor (Fig 2).

Fig 2: Locating Knock Sensor
Courtesy of DAIMLERCHRYSLER CORP.