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Buick
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2002
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Century Custom
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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 - 3.1L Engine
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Diagnostic Tests
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DTC P0171: Lean Fuel Trim System (Bank 1)
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Conditions For Setting DTC
Conditions For Setting DTC
The average long term fuel trim value is greater than 20 percent for 6 seconds.