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P0507 - Idle Air Control System Rpm Higher Than Expected

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P0507 - IDLE AIR CONTROL SYSTEM RPM HIGHER THAN EXPECTED

Description:  This DTC is set when the PCM detects actual engine speed that is greater than the desired RPM.
Possible Causes: 
  • Air leaks after the MAF sensor
  • Vacuum leaks
  • EGR valve leaks vacuum
Diagnostic Aids:  This DTC is informational only and it may be accompanied by other DTCs. Diagnose other DTCs first. If other DTCs are not present, inspect the entire intake air system for restrictions. Repair as necessary. If no restrictions are found, clear the DTCs.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   This DTC is informational only and it may be accompanied by other DTCs. Diagnose other DTCs first. If other DTCs are not present, inspect the entire intake air system for restrictions. Repair as necessary. If no restrictions are found, clear the DTCs.