What is the fault when the ABS light on the car is on?

[LeAddyson]

The illumination of the ABS light in a car indicates a malfunction in the anti-lock braking system. Reason 1: The ABS wheel speed sensor's sensing part is covered by mud, sludge, or other contaminants, affecting the sensor's ability to detect the corresponding vehicle speed signal. This prevents the ABS computer from determining the vehicle speed and the wheel slip rate, thus failing to issue appropriate commands to adjust braking. How to fix: Clean the dirt on the wheel speed sensor and adjust the gap between the sensor and the signal ring to restore normal function. Reason 2: Poor signal due to loose connections between system lines or poor contact in the ABS relay can cause system failure. The most common issue is a loose connection in the wheel speed sensor wiring, which will also show up as a poor wheel speed sensor signal in the ABS computer's fault memory. How to fix: Check the wiring connections and reconnect any loose parts.