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Home >> Kia >> 2008 >> Optima EX, 2.7 4 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - Fuel System (G6EA-GSL 2.7L) >> OBD-II Review >> 3. OBD-II System Readiness Tests >> 1) Catalyst Monitoring

1) Catalyst Monitoring

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

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