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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P1133 Or P1153: Ho2S Circuit - Insufficient Switching (Bank 1 & 2, Sensor 1) >> Conditions For Setting DTC

Conditions For Setting DTC

The HO2S lean-to-rich and rich-to-lean switches are less than a calibrated value.

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