What causes the ABS and skid control lights to illuminate in a Golf?

[DiAnderson]

The reasons for the ABS and skid control lights illuminating in a Golf are as follows: Reason 1: The ABS wheel speed sensor's sensing area is covered by mud, sludge, or other contaminants, affecting the sensor's ability to detect the corresponding vehicle speed signal. This prevents the ABS control unit from determining the vehicle speed and the wheel slip rate, thus being unable to issue appropriate commands to adjust braking. Solution: Clean the dirt from the wheel speed sensor and adjust the gap between the sensor and the signal ring to restore normal operation. Reason 2: Poor signal transmission due to loose connections between system wiring or poor contact in the ABS relay, leading to system malfunction. 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 control unit's fault memory. Solution: Inspect the wiring connections and reconnect any loose parts.