Knock Sensor: Service and Repair

Knock Sensor (KS) - 3.7L





NOTE: LH cylinder head removed from art for clarity.









Removal and Installation

1. Remove the thermostat housing.

2. Remove the lower intake manifold.

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


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

5. Remove the 2 bolts and the KS (Knock Sensor).
- To install, tighten to 20 Nm (177 lb-in).


6. To install, reverse the removal procedure.
- NOTICE: Early build vehicle cooling systems are filled with Motorcraft(R) Specialty Green Engine Coolant. Late build vehicle cooling systems are filled with Motorcraft(R) Specialty Orange Engine Coolant. Do not mix coolant types. Mixing coolant types degrades the corrosion protection of the coolant. Failure to follow these instructions may damage the engine or cooling system.

NOTICE: 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 the same type of clean engine coolant that was drained from the system.