

Air bag warning labels, required by the U.S. National Highway Traffic Safety Administration (NHTSA), are attached to alert the driver and passengers of potential risks of the air bag system. Be sure to read all of the information about the air bags that are installed on your vehicle in this Owners Manual.
Additional Safety PrecautionsHyundai Elantra AD (2016-2020) Service Manual: Cluster Ionizer Description and Operation
Description
The cluster ionizer makes disinfection and decomposition of
bad smell from the air-conditioner or inflow air. And it cleans the
inside air of a vehicle.
When the ignition switch is ON, the ionizer runs "CLEAN" mode and then "ION" mode, switching between both modes.
In the “CL ...
Hyundai Elantra AD (2016-2020) Service Manual: Heated Oxygen Sensor (HO2S) Repair procedures
Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the HO2S connector.
3.
Measure resistance between the HO2S terminals 2 and 5 [B1/S1].
Measure resistance between the HO2S terminals 3 and 4 [B1/S2].
4.
Check that the resistance is within the specification.
Specification : ...