Impreza 2.5 RS Coupe F4-2.5L SOHC (2000)
Oxygen Sensor: Description and Operation
Front Oxygen (A/F) Sensor
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The front oxygen (A/F) sensor uses zirconium oxide (ZrO(2)) which is a solid electrolyte, at portions exposed to exhaust gas.
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The zirconium oxide has the property of generating electromotive force when contacting an oxygen ion, and the electromotive force generated
varies depending on the amount of oxygen ion.