This Is My First Forum Question.i Bought My 1999 Prerunner 6 Months Ago And Is Idling High. It Drops A Little After Warming Up, But The Idle Is Still Too High. My Engine Light Came On And I Put It On A Computer And It Showed The Code "p0505,idle Control System Malfunction". Has Anyone Had This Problem And What Conclusion You Have Come Up With? I Would Like To Fix This Myself If It Is A Part To Change. Thanks For Any Help.

 

usually its your ICV (idle control valve) usually located on top the throttle body.

 

Is It The "idle Air Control Valve" And If It Is, Is It Easy To Change?