P0507: Idle Air Control (IAC) System Rpm Higher Than Expected (Vehicles With Electronic Throttle Control (Etc))

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

P0507 - IDLE AIR CONTROL (IAC) SYSTEM RPM HIGHER THAN EXPECTED (VEHICLES WITH ELECTRONIC THROTTLE CONTROL (ETC))

Description:	This DTC is set when the powertrain control module (PCM) detects an engine idle speed that is greater than the desired RPM.
Possible Causes:	Air intake leak after throttle body. Vacuum leaks. Failed EVAP system. EGR valve leaks vacuum. Damaged electronic throttle body (ETB). Damaged PCM.
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 intake air system for air or vacuum leaks and damage. If no concerns are present, clear the DTC and retest.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
Vehicles with electronic throttle control (ETC)	Refer to the Description, Possible Causes and Diagnostic Aids for the DTC in question.	Refer to the Description, Possible Causes and Diagnostic Aids for the DTC in question.	Refer to the Description, Possible Causes and Diagnostic Aids for the DTC in question.