Exhaust oxygen concentration sensor (BMW X5 E53)

Oxygen concentration sensors in the exhaust gas are installed in a complex with a triple-action catalytic converter. They provide feedback between the process of complete combustion of fuel and the ECU-KSUD, on the presence of residual oxygen in the exhaust gas. Signals from the oxygen concentration sensor (oxygen sensor) the exhaust gas generates control signals to maintain the optimal composition of the fuel-air mixture, close to stoichiometric.

The oxygen sensor provides the ECU-KSUD with information about the residual oxygen content in the exhaust gas in the form of a voltage signal. When the working mixture is over-enriched or over-lean, the mixture composition is adjusted by changing the fuel injection duration. Since the normal operation of the sensor is ensured starting from a temperature of about 350°C, a heating element is located in the sensor rod, which is switched on via a relay. In the event of a sensor malfunction, the mixture composition is adjusted based on a constant signal value of 0.45 V, entered into the ECU-KSUD memory.