Why does the ABS light come on?

[SanIvan]

ABS 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 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. Solution: Clean the dirt off the speed sensor and adjust the gap between the speed sensor and the signal ring to restore normal function. 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 connector causing the fault. In such cases, the ABS computer's fault memory will also indicate a poor speed sensor signal. Solution: Check the line connections and reconnect any loose parts.