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Chevrolet
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2002
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Blazer 4D Utility, 4WD, Part Time
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Repair and Diagnosis
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Engine Performance
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Testing & Diagnosis
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Engine Controls Self-Diagnostics - 4.3L
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Diagnostic Tests
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DTC P1133 & P1153: Ho2S Circuit - Insufficient Switching - Bank 1 & 2, Sensor 1 (Jimmy CANADIAN, SONOMA & S10 Pickup)
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Conditions For Setting DTC
Conditions For Setting DTC
The HO2S lean to rich and rich to lean switches are less than a calibrated value.