LEMON Manuals
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Chevrolet
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2007
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Impala Police
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls And Fuel - 3.9L - DTC P0420 To DTC P3433
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DTC P1400
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Circuit/System Verification
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Circuit/System Verification
Allow the engine to cool.
Start and idle the engine for at least 2 minutes.
DTC P1400 should run and pass.