KIA Niro: Knock Sensor (KS)


Knock Sensor (KS) Description and operation

Knock Sensor (KS) Description and operation


Knocking is a phenomenon characterized by undesirable vibration and noise that can cause engine
damage. Knock Sensor (KS) is installed on the cylinder block and senses engine knocking.

When knocking occurs, the vibration from the cylinder block is applied as pressure to the piezoelectric element, and the sensor produces voltage signal to ECM. On receipt of this signal, ECM will control the ignition timing by retarding the ignition timing and then advancing the ignition timing when the knocking disappears. This sequential control can improve engine power, torque and fuel economy.

Circuit Diagram

Circuit Diagram

Harness Connector

Harness Connector

Knock Sensor (KS) Repair procedures

Knock Sensor (KS) Repair procedures


  1. Switch "OFF" the ignition and disconnect the negative (-) battery terminal.
  2. Remove the intake manifold.

    (Refer to Engine Mechanical System - "Intanke Manifold")

  3. Remove the installation bolt (A), and then remove the sensor (B) from the cylinder block.

Knock sensor mounting bolt: 18.6 - 23.5 N*m (1.9 - 2.4 kgf*m, 13.7 - 17.4 lb*ft)




  • Install the component to the specified torque.
  • Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.
  1. Install in the reverse order of removal.


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