Arnott’s aftermarket ride height sensor is made from quality components including durable injection molded resin and rugged mounting points and is tested up to 1 million cycles for a long service life Arnott's aftermarket ride height sensor measures the varying distances between the road and the vehicle's chassis to provide input to a vehicle’s Electronic Control Unit (ECU) which then sends a signal to the air suspension compressor to fill or release air for the vehicle's air struts Ride height sensors can wear out and are vulnerable to damage from road debris, accidents, water and salt intrusion Shops should replace a faulty ride height sensor to prevent further damage to the vehicle's air suspension system Arnott’s aftermarket ride height sensor is backed by Arnott's industry leading warranty.