Front ABS wheel speed sensor, part of the anti-lock braking system’s wheel speed sensing circuit.

The sensor mounts at the front wheel station and reads the toothed exciter ring rotating with the hub, supplying the wheel speed signal the ABS control module uses to detect impending wheel lock and modulate brake pressure at that wheel.

The sensor is not handed: the same part serves both the left-hand and right-hand front positions, and one is fitted at each front wheel.