What causes the ABS light to come on during a vehicle inspection?

[VanEmmett]

The reasons for the ABS light coming on during a vehicle inspection are: 1. Air in the system pipelines; 2. Malfunction of the system computer; 3. Faulty wheel speed sensor; 4. Broken ABS wiring harness. If there is air in the ABS system pipelines, it will severely interfere with the regulation of dynamic pressure, causing the ABS system to lose functionality. If the computer malfunctions, the ABS will not operate properly. The activation and deactivation of ABS rely on the wheel speed sensor transmitting signals to the computer. If the wheel speed sensor fails, the ABS will inevitably not function correctly. Dirty sensor connectors or incorrect air gaps in the sensor can also lead to poor sensor performance. For example, if the sensing part of the ABS wheel speed sensor is covered by dirt, mud, or other contaminants, it will affect the sensor's ability to detect the corresponding speed signal.