Hyundai Tucson: Knock Sensor (KS)

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Engine Control - Fuel System / Knock Sensor (KS)


Knocking is a phenomenon characterized by undesirable vibration and noise and 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. At this time, this sensor transfers the voltage signal higher than the specified value to the ECM and the ECM retards the ignition timing.



Circuit Diagram

Circuit Diagram

Harness Connector

Harness Connector



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

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

  1. Remove the MHSG.

(Refer to Engine Electrical System - "Mild Hybrid Starter Generator (MHSG)")

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

Tightening Torque : 18.6 - 24.5 N.m (1.9 - 2.5 kgf.m, 13.7 - 18.1 lb-ft)




  • Install the component with the specified torques.
  • Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.
  1. Install in the reverse order of removal.


     Heated Oxygen Sensor (H02S)

    Description Heated Oxygen Sensor (HO2S) consists of the zirconium and the alumina and is installed on upstream and downstream of the Manifold Catalyst Converter (MCC). In order that this sensor normally operates, the temperature of the sensor

     Exhaust Gas Temperature Sensor (EGTS)

    Description Exhaust Gas Temperature Sensor (EGTS) is installed on Gasoline Particulate Filter (GPF) senses the temperature of exhaust gas flowing into. When pre-determined engine condition is set, ECM burns soot gathered in GPF with exhaust ga

     EGR Temperature Sensor

    Description EGR temperature sensor is used for temperature measurement and EGR bypass valve function diagnosis as well as thermal protection of EGR system. Specification Type : Thermistor type Circuit Diagram Harness Connecto


     Auto defogging actuator

    Components Location Auto defogging actuator Inspection Turn the ignition switch OFF. Disconnect the auto defogging connector. Verify that the auto defogging actuator operates to the open position when connecting 12V to termina

     Side airbag (SAB)

    Components Location Side airbag (SAB) Removal Disconnect the batteiy negative terminal. WARNING After disconnecting the cables, wait at least 3 minutes. Remove the front seat back cover. (Refer to Body - "Front Seat Back