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Home >> Hyundai >> 2023 >> Sonata SEL Plus >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - 1.6L (Except HEV) >> Description & Operation >> OBD-II Review >> OBD-II System Readiness Tests >> Catalyst Monitoring
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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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