The Freightliner and Detroit 21 Inch Long DOC Outlet Temperature Sensor is a reliable and environmentally friendly choice for proper ATS functionality without compromising fuel consumption. This sensor, sold individually, is directly replaceable with OE sensors and has been rigorously tested at the Dinex Test Center and accredited by a third party. With easy installation and compatibility with most Freightliner and Detroit makes and models, this sensor is a practical and efficient choice. Measuring 21 inches long, 1.56 inches wide, and 1.56 inches tall, this sensor meets EPA 10 exhaust emission norms and directly replaces OE numbers A6805402117 and A6805402717.