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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 P0401: EGR System
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Conditions For Setting DTC
July 1:
So it begins
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Conditions For Setting DTC
The MAP changes monitored during EGR flow test indicate insufficient EGR flow.