The Smart NOx Sensor from Continental is designed to meet increasing global performance requirements and emissions regulations. The sensor consists of the sensing element and the ECU combined with a 24 to 35 in (610 to 889 mm) cable. Similar to a linear lambda sensor, electrochemical pumps adjust the oxygen concentration in the cavities of the sensing element. The NOx concentration in the exhaust gas is derived from the electrical current controlling the pumps. Based on this measurement, the ECU generates three output signals, NOx, binary λ, and linear λ, which are transmitted to the engine ECU digitally via CAN bus. To comply with upcoming emissions legislation, the NOx sensor helps control various exhaust gas aftertreatment systems in both gasoline and diesel engines and helps decrease fuel consumption.