Flex AWD V6-3.5L (2009)
Knock Sensor: Service and Repair
Knock Sensor (KS)
NOTE: LH cylinder head removed from art for clarity.
Removal and Installation
NOTICE: Early build vehicle (built before January 19, 2009) cooling systems are filled with Motorcraft(R) Premium Gold Engine Coolant.
Late build vehicle (built on or after January 19, 2009) cooling systems are filled with Motorcraft(R) Specialty Green Engine Coolant. Mixing
coolant types degrades the corrosion protection of the coolant. Do not mix coolant types. Failure to follow these instructions may result in
engine or cooling system damage.
1. Remove the thermostat housing.
2. Remove the lower intake manifold.
3. Remove the coolant tube.
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Discard the O-ring seal.
4. Disconnect the Knock Sensor (KS) electrical connector.
5. Remove the 2 bolts and the KS.
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To install, tighten to 20 Nm (177 lb-in).
6. To install, reverse the removal procedure.
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Lubricate the new O-ring seal with clean engine coolant.
