2003 Cadillac Deville locate knock sensor

Under the intake manifold. Here is what I have for a picture, and the procedure.

Knock Sensor Replacement
Removal Procedure

Remove the intake manifold. Refer to Intake Manifold Replacement in Engine Mechanical.
Disconnect the knock sensor electrical connector.
Remove the knock sensor (KS).
Installation Procedure
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Install the knock sensor.
Tighten
Tighten the knock sensor to 25 N Â m (18 lb ft).

Connect the knock sensor electrical connector.
Reinstall the intake manifold. Refer to Intake Manifold Replacement in Engine Mechanical.