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Home >> Mercedes Benz >> 1989 >> 560SL >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Theory/Operation >> Computerized Engine Controls >> Input Devices >> Oxygen Sensor
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Oxygen Sensor

Oxygen sensor is heated to control operating temperature. Based on voltage signals from oxygen sensor, the ECU controls fuel mixture in an attempt to maintain 14.7:1 air/fuel ratio. If oxygen sensor failure is present, check engine light illuminates, indicating malfunction code is stored in ECU.

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