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Chevrolet
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2002
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Impala Base, 3.4 E
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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 - 3.4L
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Diagnostic Tests
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DTC P0442: EVAP System - Leak Detected
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Conditions For Setting DTC
Conditions For Setting DTC
The EVAP system can achieve vacuum, but a vacuum decay is detected during the diagnostic test.