# Would an airleak PAST the MAF cause an IACV check engine? **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** nissan, maxima\ **Created:** [July 19, 2009, 3:14pm UTC](https://community.cartalk.com/t/would-an-airleak-past-the-maf-cause-an-iacv-check-engine/33642 "2009-07-19T15:14:34Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![brokemaxownr](https://avatars.discourse-cdn.com/v4/letter/b/bb73d2/32.png) [@brokemaxownr](https://community.cartalk.com/u/brokemaxownr)\ **Post date:** [July 19, 2009, 3:14pm UTC](https://community.cartalk.com/t/would-an-airleak-past-the-maf-cause-an-iacv-check-engine/33642/1 "2009-07-19T15:14:34Z")
I was getting a P0505 (IDLE AIR control valve) code on a 95maxima with 205K miles. But idle under all conditions was fine. I cleaned the connectors and so far, it has not comeback on - BUT I later found this ‘insulator’ was bad and leaking air after the MAF - [http://www…28908.html](http://www.courtesyparts.com/16523r-insulator-air-duct-maxima-a32b-1995-1999-p-128908.html) (see figure for part #16523). It has since been replaced. Is it likely that would cause a IAC code? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [July 19, 2009, 4:56pm UTC](https://community.cartalk.com/t/would-an-airleak-past-the-maf-cause-an-iacv-check-engine/33642/2 "2009-07-19T16:56:08Z")
Yes. Any leak after the MAF sensor will cause a P0505 DTC. Tester ---
**Author:** ![brokemaxownr](https://avatars.discourse-cdn.com/v4/letter/b/bb73d2/32.png) [@brokemaxownr](https://community.cartalk.com/u/brokemaxownr)\ **Post date:** [July 19, 2009, 9:26pm UTC](https://community.cartalk.com/t/would-an-airleak-past-the-maf-cause-an-iacv-check-engine/33642/3 "2009-07-19T21:26:39Z")
thanks - I was figuring it would be related. Smoothsailing.