Brakes
ABS Warning Light — Common Causes and Fixes
The ABS warning light indicates a fault in the anti-lock braking system, often caused by a failed wheel speed sensor or damaged reluctor ring.
The ABS system prevents wheel lock-up during emergency braking. When the warning light comes on, the system has detected a fault and will disable ABS functionality — your normal brakes will still work, but without anti-lock assistance. The most common cause across cars and vans is a failed wheel speed sensor, which can be triggered by debris, corrosion, or physical damage. A damaged reluctor ring, worn wiring, or a blown ABS fuse are other frequent culprits. A diagnostic scan identifies which sensor has failed, allowing targeted replacement.
Key takeaways
- Normal braking still works when the ABS light is on, but without anti-lock function
- Wheel speed sensors are the most common ABS failure point
- A diagnostic scan pinpoints exactly which sensor or component has failed
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