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Home >> GMC >> 2001 >> Jimmy 4D Utility, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P1133 Or P1153: Heated Oxygen Sensor - Insufficient Switching ("L" & "M" Series) >> Diagnostic Aids

Diagnostic Aids

Check HO2S heater operation. Never solder HO2S wire. An intermittent may be caused by poor connection, rubbed-through wire insulation or broken wire inside insulation.