Exhaust-gas sensor for an internal combustion engine

An exhaust gas sensor for an exhaust gas system of an internal combustion engine, the exhaust gas sensor comprising:

• a main body;
• a pump electrode arranged in a pump cavity of the main body;
• a measuring electrode arranged in a measuring cavity of the main body and connected to the pump cavity;
• a reference electrode in a reference cavity of the main body and connected to ambient air;
• and
• a control unit electrically connected to the pump electrode, the measuring electrode, and the reference electrode and designed to:
• discharge oxygen from the measuring cavity by applying a measurement current to the measuring electrode so a measurement voltage between the measuring electrode and the reference electrode is kept at a predetermined first setpoint value;
• discharge oxygen from the pump cavity by applying a pump current to the pump electrode so an electrode voltage between the pump electrode and the reference electrode is kept at a predetermined second setpoint value;
• determine a nitrogen oxide value based at least in part on a value of the measurement current;
• and
• adapt at least one of:
• the first setpoint value for the measurement voltage based on the determined nitrogen oxide value and the second setpoint value for the electrode voltage based on the determined nitrogen oxide value.