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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 P0140: Ho2S Circuit - Insufficient Activity - Bank 1, Sensor 2
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Conditions For Setting DTC
Conditions For Setting DTC
The HO2S signal voltage is steady between 400-499 mV for 150 seconds.
The Throttle Position (TP) changes more than 5 percent within 1 second, 6 times.