Patent ID: 7913550

Claim:
A method of diagnosing an exhaust gas sensor disposed in an exhaust gas region of an internal combustion engine, the method comprising: detecting a change in at least one operating parameter of the internal combustion engine or a change in at least one exhaust gas parameter during miming operation of the internal combustion engine; ascertaining an exhaust gas component measurement from the exhaust gas sensor during running operation of the internal combustion engine; and comparing the exhaust gas component measurement to a calculated value of the exhaust gas component measurement, the calculated value being based upon at least one operating parameter during running operation of the internal combustion engine; wherein the diagnosis is non-intervening into a control loop of the internal combustion engine and, where an emission control system is present, non-intervening into a control loop for the metering of a reagent substance into an exhaust gas region of the internal combustion engine.