Legacy Outback Wagon F4-2.5L SOHC (2000)
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The difference in oxygen concentration changes greatly in the vicinity of the optimum air-fuel ratio, and hence the change in the electromotive
force is also large. By inputting this information into the ECM, the air-fuel ratio of the supplied mixture can be determined easily. The front
oxygen (A/F) sensor does not generate much electromotive force when the temperature is low. The characteristics of the electromotive force
stabilize at temperature of approximately 700 °C (1,292 °F)