in a method of controlling a sensor for determining an oxygen concentration in a gas mixture , in particular in the exhaust gas of internal combustion engines , a detection voltage supplied by a nernst measurement cell and corresponding to the oxygen concentration is transformed by a circuit arrangement into a pump voltage for a pump cell , and an anodic or cathodic limit current flows over the pump cell , depending on the oxygen content of the gas mixture . in stable operation of the sensor , during which an anodic limit current flows for a selectable period of time , the pump cell and / or the nernst measurement cell receives at least one voltage pulse supplied independently by the measured detection voltage or the pump current thus established , so that the sensor is depolarized .