* Wheel Speed Sensor: This is the most common culprit. A faulty wheel speed sensor prevents the ABS system from accurately measuring wheel speed, triggering the warning lights. Dirt, damage to the sensor itself, or wiring problems are typical issues. Each wheel has a sensor, so it could be any of them.
* ABS Module: The ABS module is the "brain" of the system. Internal failure within the module can lead to the warning lights illuminating. This is usually a more expensive repair.
* Wiring: Damaged, corroded, or loose wiring in the ABS system can interrupt signals and cause the lights to come on. This often happens near the wheel speed sensors, where the wires are subject to wear and tear.
* Low Brake Fluid: While less likely to trigger *both* lights, critically low brake fluid can affect the ABS system and potentially illuminate the warnings. Check your brake fluid level.
* ABS Pump: A failing ABS pump can also contribute to the problem.
What you should do:
1. Check Brake Fluid: First, check your brake fluid level in the master cylinder reservoir. Low fluid is a serious issue and needs immediate attention.
2. Have it Diagnosed: The best course of action is to have your vehicle diagnosed by a qualified mechanic, preferably one with experience in older vehicles. They can use a scan tool capable of reading ABS codes to pinpoint the exact problem. This will save you time and money by avoiding unnecessary repairs.
3. Don't Ignore it: Driving with these lights on means your ABS is not functioning. While you can still brake, you will lose the anti-lock function which could be critical in an emergency.
Important Note: Attempting to diagnose and repair ABS systems yourself can be dangerous and potentially damaging if you lack the proper expertise and equipment. It's best to leave this to a professional.
