Sable V6-183 3.0L VIN U FI (1998)
Oxygen Sensor: Description and Operation
The Heated Oxygen Sensors (HO2S):
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are located in the exhaust system
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react with the oxygen in the exhaust gases and generate a voltage based on this reaction.
A low voltage indicates too much oxygen or a lean condition.
A high voltage indicates not enough oxygen or a rich condition.