Arnott's aftermarket ride height sensors are designed to level your vehicle by measuring the varying distances between the road and the vehicle's chassis. The Electronic Control Unit (ECU) is provided with this information and sends a signal to the air suspension compressor to increase or decrease the air in the air struts appropriately. Ride height sensors can wear out and are vulnerable to damage from road debris, accidents, water and salt intrusion. Ride Height Sensors should be replaced to prevent further damage to the vehicle’s air suspension system.