Knock Sensor: Service and Repair

Knock Sensor (KS)













Removal and Installation

1. Remove the thermostat housing. For additional information, refer to Engine Cooling Service and Repair.

2. Remove the lower intake manifold. For additional information, refer to Engine - 3.5L Lower Intake Manifold.

3. Remove the coolant tube.
- Discard the O-ring seal.

4. Disconnect the Knock Sensor (KS) electrical connector.

5. NOTICE: Only use hand tools when removing or installing the Knock Sensor (KS) or damage to the KS can occur.

Remove the 2 bolts and the KS.

- To install, tighten to 20 Nm (177 lb-in).

6. To install, reverse the removal procedure.

- NOTE: Genuine Mazda(R) Extended Life Coolant and Motorcraft(R) Specialty Green Engine Coolant are very sensitive to light. Do NOT allow these products to be exposed to ANY LIGHT for more than a day or two. Extended light exposure causes these products to degrade.

Lubricate the new O-ring seal with clean engine coolant.