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Chevrolet
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2003
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TrailBlazer 5.3 P, 4WD
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System - Self-Diagnostics - 5.3L
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Drive Cycles
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Inspection/Maintenance Heated Oxygen Sensor/Oxygen Sensor System Set Procedure
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Conditions for Running
Conditions for Running
The Engine Coolant Temperature (ECT) is more than 135°F (57°C).
The engine is running in Closed Loop fuel control.
The engine has been running for more than 160 seconds.
The battery voltage is between 9-18 volts.