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GMC
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2006
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Envoy 4.2 S, 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 - 4.2L - DTC P0135 To P0418
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DTC P0411
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DTC Descriptor
DTC Descriptor
DTC P0411
Secondary Air Injection (AIR) System Incorrect Air Flow Detected