Theory Of Operation

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The upstream Oxygen Sensor is a fast-acting, wide band Oxygen Sensor that measures oxygen content in the exhaust gas. The sensing element uses zirconium dioxide (ZrO2), or zirconium, in a ceramic substrate. The sensing element creates a voltage in response to oxygen levels. The upstream Oxygen Sensor also contains an oxygen pumping function that provides the wideband sensing capabilities. The pumping feature is critical for proper oxygen measurement. The sensing element is bonded to an alumina ceramic layer that contains a heating element. The quick-acting heater allows the sensor to reach operating temperature in less than 8 seconds. The operating temperature ranges from 600°C to 830°C (1112°F to 1526°F). The sensing element can withstand temperatures of up to 950°C (1742°F). The connector is completely sealed and waterproof because there is no need for a reference sample of atmospheric oxygen.