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Home >> Ford >> 2002 >> Crown Victoria Base, 4.6 9 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Controls - Theory & Operation - Gasoline & NGV) >> Catalyst & Exhaust Systems >> Exhaust System >> Upstream & Downstream Heated Oxygen Sensors

Upstream & Downstream Heated Oxygen Sensors

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Heated Oxygen Sensors (HO2S) provide PCM with voltage and frequency information related to oxygen content of exhaust gas. For additional HO2S information, see HEATED OXYGEN SENSOR  under PCM INPUTS under COMPUTERIZED ENGINE CONTROLS. In addition to providing PCM with indications of how rich or lean the engine is operating, upstream HO2S signal serves as an input to HO2S monitor. Downstream HO2S signal is an input to Catalyst Efficiency Monitor. For additional Catalyst Efficiency Monitor information, see CATALYST EFFICIENCY MONITOR DESCRIPTION  under DIAGNOSTIC MONITORS under COMPUTERIZED ENGINE CONTROLS.

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