2000 S70 Base DTC P0505: 1275634 Air assisted control valve (AACV)

[BramV70]

Having the same problem here and am wondering on the result of the last post of tharim:

"Hoping the relay will fix it, but am always willing to listen to good advice/ideas."

Any update, did the relay change fix it or does the problem originate further upstream?

Thank you!

[abscate]

Added part number to the AACV to the thread title

This is found only on the 1999- P80mand some P2 cars with ETM and replaces the IAC system on the earlier cars

This part is NLA as of Feb 2021, junkyard or eBay only. Not too rare to find for $35 or so

The valve bleeds idle air into ports in the fuel injector manifold rail. Another the ETM and this valve contribute to idle air