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Home >> Hyundai >> 2000 >> Accent GL, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0133, P0134: Front Ho2S Circuit Slow Response Or No Activity Detected >> Notes
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DTC P0133, P0134: Front Ho2S Circuit Slow Response Or No Activity Detected: Notes

NOTE: There is a Heated Oxygen Sensor (HO2S) before and one after the catalytic converter. The front HO2S measures oxygen content of exhaust gases and is used to control air fuel mixture. The rear HO2S is used to determine the efficiency of the catalytic converter. ECM calculates catalytic converter efficiency by comparing front and rear HO2S signals.
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