Abstract: A method of performing a diagnosis of an exhaust gas sensor disposed in an exhaust gas region of an internal combustion engine testing the sensor to determine whether a change of at least one exhaust gas component, which is detectable by the exhaust gas sensor, results in an expected change of the sensor signal, and implementing the diagnosis if a specified change in at least one operating parameter of the internal combustion engine and/or at least one parameter of the exhaust gas in the running operation of the internal combustion engine are detected.

Abstract: A method to diagnose an exhaust gas sensor disposed in the exhaust gas region of an internal combustion engine, wherein provision is made for a comparison of a measurement for at least one exhaust gas component with a measurement of the exhaust gas component, which is ascertained on the basis of an exhaust gas sensor signal, and a device to implement the method are proposed. The diagnosis is only implemented if a change in at least one operating parameter of the internal combustion engine and/or at least one parameter of the exhaust gas is detected during the running operation of the internal combustion engine. Provision is made in the diagnosis for an averaging of the measurement for at least the one exhaust gas component as well as of the measurement for the exhaust gas component, which is provided by the exhaust gas sensor.

Abstract: A method to diagnose an exhaust gas sensor disposed in the exhaust gas region of an internal combustion engine, wherein provision is made for a comparison of a measurement for at least one exhaust gas component with a measurement of the exhaust gas component, which is ascertained on the basis of an exhaust gas sensor signal, and a device to implement the method are proposed. The diagnosis is only implemented if a change in at least one operating parameter of the internal combustion engine and/or at least one parameter of the exhaust gas is detected during the running operation of the internal combustion engine. Provision is made in the diagnosis for an averaging of the measurement for at least the one exhaust gas component as well as of the measurement for the exhaust gas component, which is provided by the exhaust gas sensor.

Abstract: A method to diagnose an exhaust gas sensor (16) disposed in an exhaust gas region (13) of an internal combustion engine (10), whereby a test is made at said sensor to determine whether a change of at least one exhaust gas component, which is detectable by the exhaust gas sensor (16), results in an expected change of the sensor signal (s_Mes), and a device for the implementation of the method are proposed. The diagnosis is only implemented if a specified change in at least one operating parameter (Md, n, agr) of the internal combustion engine (10) and/or at least one parameter (ms_Abg, NOx, ms_NOx) of the exhaust gas in the running operation of the internal combustion engine (10) are detected.