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Hummer
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2005
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H2 4D Utility Pickup
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Troubleshooting
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Troubleshooting
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Inspection/Maintenance (I/M) Heated Oxygen Sensor/Oxygen Sensor (HO2S/O2S) System Set Procedure
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Conditions for Running
Conditions for Running
The fuel level is more than 10 percent.
The engine coolant temperature (ECT) is more than 60°C (140°F).
The battery voltage is between 10-18 volts.
The fuel alcohol content is less than 90 percent.