What does the ABS warning light indicate?

The ABS warning light is specifically designed to alert the driver to issues within the anti-lock braking system itself. When this light is illuminated on the dashboard, it signifies that there is a malfunction or fault detected in the ABS, which is responsible for preventing wheel lock-up during hard braking, thus maintaining steering control.

This warning is crucial because it helps ensure safety by notifying the driver that the benefits of ABS, like enhanced stability and control during braking, may not be operational. Prompt attention to the ABS warning light is necessary to address whatever issue may be present, be it a sensor failure, wiring issue, or a fault in the ABS control module, among other possibilities.

In contrast, the other options relate to different system concerns: standard brake function and engine performance problems are not communicated through the ABS light, and improper tire pressure is monitored by a separate tire pressure monitoring system (TPMS). Therefore, the ABS warning light serves a unique and critical function that directly relates to the safety and performance of the vehicle's braking capabilities.