To reset an ABS warning light, drain the electrical system of the car, or replace the ABS sensor if the brake system is working properly or has been recently serviced. Alternatively, check if the brake system parts need replacement or repair using an OBD code reader.
To drain the electrical system of the car, remove the positive cable from the battery of the vehicle, and press the brake pedal down. Draining the vehicle's electrical system resets its central computer. Reconnect the positive cable to the car battery to restore power. This method may not completely reset the ABS warning light, but it can help to keep it off for up to a week.
If the light turns on despite draining the car's electrical system, replace the vehicle's ABS sensor. To do this, remove the sensor's housing on the wheel hub and disconnect the wire. Attach the replacement sensor, and reset the car's computer by draining its electrical system.
To use an OBD code reader, connect the unit to the diagnostics system in the car. The reader displays codes that reflect the part of the brake system that needs fixing. If you do not have an OBD code reader, approach a technician, mechanic or an auto supply shop.