2012 Mazda CX-9 FWD V6-3.7LFACTORY OEM SERVICE PROCEDURE

Knock Sensor: Service and Repair





KNOCK SENSOR (KS) REMOVAL/INSTALLATION [MZI-3.7]

NOTE:
- Put a tray under the converter housing to receive the engine coolant.

Factory service manual diagram





1. Disconnect the negative battery cable. Removal and Replacement

2. Perform the following procedure for easier access.
a. Remove the ventilation hose. Quick Release Connector Removal/Installation

b. Remove the vacuum hose (to purge solenoid valve). Quick Release Connector Removal/Installation

c. Remove the fuel hose. Quick Release Connector Removal/Installation

d. Remove the fuel distributor. Service and Repair

e. Remove the intake manifold. Service and Repair

3. Remove in the order indicated in the table.

Factory service manual diagram





Factory service manual diagram




NOTE:
- Lubricate the new O-ring with clean engine coolant for installation.

4. Install in the reverse order of removal.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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