The method and diagnostic apparatus for diagnosing a heated exhaust probe of an internal combustion engine

The invention relates to a method (71) for diagnosis of a heated exhaust gas sensor (11) of an internal combustion engine, in which by means of a voltage source (41, 51) a predetermined time varying or constant voltage (U time varying or constant current (I To provide a method (71) for diagnosing the exhaust gas probe (11) which allows a reliable and accurate diagnosis of the exhaust gas probe (11) and a statement of the type of any existing error in the exhaust gas probe (11) allows, it is proposed that the process (71) is carried out independently by a control and / or regulating device of internal combustion engine, wherein an operating temperature of the exhaust gas probe (11) by means of a separate by the control and / or regulating device regulating element (59) is controlled to a predetermined temperature value.