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Home >> Mercury >> 1994 >> Tracer LTS, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation - EEC 1.8L >> Computerized Engine Controls >> Input Devices >> Oxygen Sensor (O2S)
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Oxygen Sensor (O2S)

Voltage signal produced by the O2S indicates oxygen content of engine exhaust gases. O2S sensor is threaded into exhaust manifold. The PCM uses the O2S signal to regulate fuel injectors for proper air/fuel mixture.