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GMC
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2004
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Envoy 4WD
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Repair and Diagnosis
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Engine Performance
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Testing & Diagnosis
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Engine Control System - 4.2L (Introduction)
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Repair Instructions
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Heated Oxygen Sensor Replacement - Position 1
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Tools Required
Tools Required
J 39194-B
Heated Oxygen Sensor Wrench. See
Special Tools and Equipment
.