Impreza WRX F4-2.0L DOHC Turbo (2004)
electromotive force is also large. By using this information, the ECM can determine the air-fuel ratio of the supplied mixture easily. The front
oxygen (A/F) sensor does not generate much electromotive force when the temperature is low. The output characteristics of the sensor stabilize at
a temperature of approximately 700 °C (1,292 °F).
