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Home >> Mercury >> 2002 >> Villager Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Monitors >> OBD-II System Readiness Tests >> Catalyst Efficiency Monitor

Catalyst Efficiency Monitor

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.

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