When a ABS component goes bad (ABS sensor, control unit, pump, relay, etc) it triggers the ABS warning light and stores a code in the ABS control unit. Every component has a code, so when you read the code in the ABS control unit you know what component has failed.
The ABS is suppose to reset every time you turn the ignition switch OFF. Next time the ABS light is ON, you should drive to an independent shop or the dealer and have them read the code, when you get to the shop DO NOT TURN THE ENGINE OFF, if you do the code will be erase.
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