2021 Mazda 3 BaseFACTORY OEM SERVICE PROCEDURE

Crankshaft Position (CKP) Sensor Removal/Installation: Notes

WARNING: This page is about a different variant/trim than selected.

Replacement Part 

O-ring
Quantity: 1
Location of use: CKP sensor

Oil and Chemical Type 

Engine oil
Type: Recommended oil
CAUTION:
  • When replacing the CKP sensor, make sure there is no foreign matter on it such as metal shavings. If it is installed with foreign matter, the sensor output signal will malfunction resulting from fluctuation in magnetic flux and cause a deterioration in engine control.
  • When replacing the CKP sensor with a new one, perform the CKP sensor learning value clearing procedure to clear the learning value stored in the PCM. If the stored learning value is not cleared, the engine performance may not function at its full capability. (See CKP Sensor Learning Value Clearing Procedure .)
  1. Turn the steering wheel to full right lock.
  2. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
  3. Lift up the vehicle.
  4. Remove the front splash shield (RH). (See SPLASH SHIELD REMOVAL/INSTALLATION .)
  5. Remove the service hole cover (installed to front under cover No. 2).
    G13714453Courtesy of MAZDA MOTORS CORP.
  6. Disconnect the CKP sensor connector.
  7. Remove the bolt.
    Fig 1: Crankshaft Position Sensor Bolt With Torque Specification
    G13714454Courtesy of MAZDA MOTORS CORP.
  8. Remove the CKP sensor.
  9. Install in the reverse order of removal.
  10. When replacing the CKP sensor with a new one, clear the learning value. (See CKP Sensor Learning Value Clearing Procedure .)
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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