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Hi, my name is***** is only one front and one rear pad wear sensor. If the warning light came on either the front or rear sensor is being cut by the brake rotor or you have a defective sensor or a fault with the wiring. The sensors are usually installed in the right side brakes. If you didn't check all 4 wheels you should do that and see if one front or rear pads is worn down to the sensor. The light is triggered by the sensors, not by time or mileage.