ABS lighting alarm has the following situations:
(1), the wheel speed sensor of the automobile is faulty. Through the computer diagnostic instrument, it can be clear which wheel speed sensor has a problem.
(2) There are two kinds of wheel speed sensor failures, one is ABS alarm caused by wheel speed sensor failure. One is that the ABS sensor is dirty, which causes the ABS sensor to fail to detect the wheel speed and causes the ABS fault light to give an alarm. If the wheel speed sensor is dirty, just clean it.
(3), wheel speed sensor circuit failure. Damage to the wheel speed sensor circuit can also lead to ABS failure. For this fault, only the wheel speed sensor harness can be replaced.
Refer to the above content: Baidu Encyclopedia -abs Anti-lock Brake System