An exhaust gas sensor system for use with an internal combustion engine having an exhaust conduit and a catalytic converter. The system includes an exhaust gas oxygen sensor, temperature sensor, and signal conditioner. The exhaust gas oxygen sensor is positioned on the conduit, downstream of the catalytic converter, and provides an oxygen level signal. The temperature sensor is also downstream of the catalytic converter, sensing the temperature of the oxygen sensor. A signal conditioner receives outputs from both the exhaust gas oxygen sensor and the temperature sensor. The oxygen level signal from the oxygen sensor is adjusted, according to the temperature sensed by the temperature sensor, to provide a more accurate oxygen level signal to other components of the engine such as, for example, an air-fuel controller.