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| 2004 to 2008 F-150 and Mark-LT 4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs. |
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#6
Fri, April 23rd, 2010, 12:59 PM
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Causes
A P0506 DTC trouble code may be caused by one or more of the following: • A vacuum leak • An air restriction in the intake air path or exhuast • A faulty positive crankcase ventilation (PCV) valve • Damaged/failed/dirty throttle body • Internal engine problem • Failed PCM Possible Solutions This DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect for vacuum leaks, restrictions, and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns. So general maintenance might clear up the issue. Peace! 
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