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Home >> Hyundai >> 2021 >> Elantra N Line, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Engine Control System - 2.0L (Except HEV)) >> Description & Operation >> OBD-II Review >> OBD-II System Readiness Tests >> Catalyst Monitoring

Catalyst Monitoring

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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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