What does it mean when the ABS red light is on?

[LeVivienne]

ABS fault light comes on for the following reasons: Reason 1: The sensing part of the ABS speed sensor is covered by mud, sludge, or other contaminants, affecting the sensor's ability to detect the corresponding 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. Solution: Clean the dirt from the speed sensor and adjust the gap between the speed sensor and the signal gear ring to restore normal operation. Reason 2: Poor signal due to loose connections between system lines or poor contact of the ABS relay, leading to system failure. The most common issue is a loose speed sensor wire connector, which will also show a poor speed sensor signal in the ABS computer's fault memory. Solution: Check the line connections and reconnect any loose parts. If the ABS light comes on after starting the car, it indicates a fault in the vehicle's anti-lock braking system. The fault should be resolved before continuing to drive the vehicle.