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Chevrolet
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2002
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Monte Carlo SS
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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 - 3.8L
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Diagnostic Tests
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DTC P0171: Fuel Trim System Lean
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Conditions For Setting DTC
Conditions For Setting DTC
DTC sets when average long term fuel trim value is more than 20 percent for more than 6 seconds.