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Chevrolet
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2008
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TrailBlazer 4.2 S, RWD
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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 & Fuel System - 4.2L - DTC P0366 To DTC P2444
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DTC P0420
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DTC Descriptor
DTC Descriptor
DTC P0420
Catalyst System Low Efficiency Bank 1