Legacy F4-2.5L SOHC (2003)
inside and outside of the tube, and the electromotive force generated is large.
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When a lean air-fuel mixture is burnt in the cylinder, relatively large amount of oxygen remains in the exhaust gases even after the catalytic action,
and this results in a small difference in the oxygen ion concentration between the tube's internal and external surfaces. The electromotive force in
this case is very small.
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The difference in oxygen concentration changes drastically in the vicinity of the stoichiometric air-fuel ratio, and hence the change in the
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).
