Hyundai Elantra: Engine Control System / Knock Sensor (KS) Repair procedures

Removal
1.
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2.
Disconnect the knock sensor connector (A).

3.
Remove the intake manifold.
(Refer to Engine Mechanical System - "Intake Manifold")
4.
Remove the installation bolt (A), and then remove the sensor from the cylinder block.

Installation
   
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.
Installation is reverse of removal.

Knock sensor installation bolt :
18.6 ~ 23.5 N.m (1.9 ~ 2.4 kgf.m, 13.7 ~ 17.4 lb-ft)

Knock Sensor (KS) Schematic Diagrams
Circuit Diagram ...

Heated Oxygen Sensor (HO2S) Description and Operation
Description Heated Oxygen Sensor (HO2S) consists of zirconium and alumina and is installed both upstream and downstream of the Catalytic Converter. It varies in accordance with the air/fuel rat ...

Other information:

Hyundai Elantra AD (2016-2020) Owners Manual: Supervision Cluster
The trip computer is a microcomputer- controlled driver information system that displays information related to driving. Information Some driving information stored in the trip computer (for example Average Vehicle Speed) resets if the battery is disconnected. Trip modes To change the tr ...

Hyundai Elantra AD (2016-2020) Service Manual: Engine Control Module (ECM) Schematic Diagrams
ECM Terminal And Input/Output signal Harness Connector ECM Terminal Function Connector [C300-A] Pin No.DescriptionConnected to1- 2ETC Motor [+] control outputETC Motor3- 4Motor [-] control outputVariable Charge Motion Actuator (VCMA)5- 6- 7- 8- 9- 10Clutch switch signal input [M/T]Clutch s ...

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