DTC P0133: Heated Oxygen Sensor (Ho2S) No. 1 Slow Response

If any DTCs besides DTC P0133 are set, diagnose those DTCs first. Before replacing HO2S No. 1, inspect sensor for contamination. If contamination is present, determine cause and repair before installing new HO2S No. 1. Replace HO2S No. 1. and retest system.