HI there
In most cases this code is the result of the idle speed being to high.This could be the IAC but also check for vacuum leaks that could be causing the engine speed to be to high. This is mounted to the back of the intake manifold. Here is some more info on the code for you
P0505 NISSAN - Idle Air Control Valve Read more: https://www.autocodes.com/p0505_nissan.html
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