http://autorepair.about.com/library/a/1g/bl969g.htm Article refers to a
Ford Escort, but I have to assume that it would apply to a 2000 Ford Focus
DTC P1506 is set when the PCM detects the engine idle speed is greater than
the desired rpm. This is most commonly caused by a dirty or bad IAC valve.
Cleaning the throttle body will, most likely, cure this problem.
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