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Mercury
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2009
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Mariner 4WD L4-2.5L
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Repair and Diagnosis
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A L L Diagnostic Trouble Codes ( DTC )
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Testing and Inspection
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Diagnostic Trouble Code Descriptions
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P Codes
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P0491
P0491
Note:
Refer to the applicable vehicle system to diagnose the body and chassis DTCs.
P0491 - Secondary Air Injection (AIR) System Insufficient Flow (Bank 1):
