Toyota Hilux parking sensors use ultrasonic technology in the bumpers to detect obstacles, alerting drivers with beeps and sometimes visual graphics, with higher trims like the SR5 often including front and rear sensors and the advanced Parking Support Brake (PKSB) system that can automatically brake. These sensors are generally ultrasonic, can be paintable, and are available as genuine or aftermarket parts for various models, offering convenience for tight parking and safety features like collision avoidance, but can often be disabled if needed for off-roading or towing.