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Chevrolet
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2003
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Silverado 1500 HD, RWD
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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 - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline
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Diagnostic Tests
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DTC P0140: Ho2S Circuit - Insufficient Activity - Bank 1, Sensor 2 & DTC P0160: Ho2S Circuit - Insufficient Activity - Bank 2, Sensor 2
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Conditions For Setting DTC
Conditions For Setting DTC
The HO2S signal voltage is steady between 410-490 mV for 150 seconds.
The Throttle Position (TP) changes more than 5 percent within 1 second, 6 times.