Wheel Speed Sensor
WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
The Wheel Speed Sensor is the essential component the ABS ECU (ESP/Electronic Stability Program) because the ESP calculates vehicle speed and determines whether wheel lock occurs based on Data from the Sensor.
For example, front-wheel vehicles use speed of a faster rear wheel as a reference when determining vehicle speed, and, if the vehicle detects difference in speed between front and rear wheel, ABS control sets in.
Wheel Speed Sensor is active hall-sensor type.