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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 96 (Engine Controls - Self-Diagnostics) >> Diagnostic Monitors >> OBD-II System Readiness Tests >> Catalyst Efficiency Monitor

Catalyst Efficiency Monitor

WARNING: This page is about a different car, the 2002 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.

The catalyst efficiency monitor is a self-test strategy within PCM that uses downstream Heated Oxygen Sensor (HO2S) to determine when a catalyst has fallen below minimum level of effectiveness in its ability to control exhaust emissions.