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Chevrolet
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2006
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Avalanche 2500
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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 - 8.1L - DTC P0172 To DTC P0496
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DTC P0420 or P0430
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DTC Descriptors
DTC Descriptors
This diagnostic procedure supports the following DTCs:
DTC P0420 Catalyst System Low Efficiency Bank 1
DTC P0430 Catalyst System Low Efficiency Bank 2