The light comes on because the car's computer has detected a fault. This fault needs to be diagnosed and repaired. Here's what you should do:
1. Have the ABS system diagnosed: The most important step is to find the source of the problem. You'll need a mechanic with a scan tool that can read ABS codes. A standard OBDII code reader usually won't work for ABS codes; a more specialized scanner is required. The scan tool will pinpoint the specific fault within the ABS system. Common causes include:
* Faulty Wheel Speed Sensor: This is a frequent culprit. The sensor monitors wheel speed, and if it's malfunctioning, the ABS system won't work correctly.
* ABS Module Problems: The module itself can fail, requiring repair or replacement (expensive).
* Low Brake Fluid: Check your brake fluid level and top it off if necessary. Low brake fluid can trigger the ABS light.
* Wiring Issues: Damaged or corroded wiring in the ABS system can cause intermittent or constant problems.
2. Repair the identified fault: Once the problem is diagnosed, the necessary repairs must be made. This could involve replacing a sensor, repairing wiring, or even replacing the ABS module.
3. The light will go out automatically: Once the problem is fixed, the ABS light should turn off after a short drive or after the system completes a self-test. If it doesn't, there might still be an issue that needs further attention.
Do NOT attempt to reset the light without addressing the underlying problem. This is extremely unsafe. Ignoring the ABS light means your ABS may not work properly, potentially leading to a loss of control during braking. Professional diagnosis and repair are essential.
