Exhaust Gas Sensors — WSU

Exhaust Gas Sensors — WSU - Exhaust Gas...

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Exhaust Gas Sensors There are two types of exhaust gas sensors: Oxygen Content Sensor - A four-wire Heated Exhaust Gas Oxygen Sensor (HEGO) measures the oxygen content of the exhaust gas. This sensor's output signal is used to indicate a lean or rich condition when compared to stoichiometric (14.7: air-fuel ratio). Normal output voltage at an idle is around 0.45 volts and can fluctuate anywhere from 0 volts to 1.0 volts. When a brake booster vacuum hose was removed from a test vehicle driving the air-fuel ratio lean, the voltage decreased to around 0.1 volts. When the air intake was restricted driving the air-fuel ratio rich, the voltage increased to around 0.9 volts. An oxygen sensor is a unique sensor because it actually produces its own variable voltage signal. When the oxygen content is low (typically indicating a rich condition), the sensor output voltage is high. When the oxygen content is high (typically indicating a lean condition), the sensor output voltage is low.
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