If your vehicle is showing abs warning light is illuminated on the dashboard, here are the most likely causes and the parts you'll need to fix each one.
Wheel speed sensors are exposed to road debris, moisture, and brake dust, making them highly susceptible to failure or signal blockage. This is the most frequent cause of an ABS warning light.
The wiring harness connecting the wheel speed sensor to the vehicle can break from constant suspension movement. It is also frequently pinched or left unclipped after recent brake or suspension work.
The ABS sensor reads a magnetic tone ring integrated into the wheel bearing or hub. If the bearing wears out, or the tone ring rusts and cracks, the sensor can no longer accurately read the wheel speed.
If a press-in wheel bearing is installed backwards during recent maintenance, the magnetic tone ring will be on the wrong side. The ABS sensor will read zero speed, immediately triggering the warning light.
An electrical short or power surge can blow the fuse or damage the relay that supplies power to the ABS system, disabling it entirely.
The computer module that controls the anti-lock brakes can suffer from internal electrical failures, corrosion, or broken solder joints over time. This is a major, but less common, failure.