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Home >> Hyundai >> 2009 >> Elantra GLS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> DTC Troubleshooting Procedures >> DTC P0133 Ho2S Circuit Slow Response (Bank 1/Sensor 1) >> DTC Description

DTC Description

The ECM monitors the HO2S (B1/S1) transition frequency for predetermined time. During the monitoring period, the ECM calculates transition times that the front HO2S switches from rich to lean and from lean to rich. With this information, an average frequency for all switches can be determined. The ECM sets DTC P0133 when the average frequency is too slow.

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