Fault code 17549.....

[SilverS8]

Hi all.

Found this code when fidling around with vcds the other day. Deleted it an checked again today an oh yes, its returned Car runs as normai without any issues other then startup when cold it revs up to apx 2000 rpm, slows down to apx 500 and back up to 2000 before is settles on 760rpm.

Google search ends up with:
-Air leak
-Maf gone bad.

Check the Live reading of maf and values are way low.

Where should i start checking for leaks? Any special vacuumlines that often fails?

Regarding new Maf Etka shows two different: 077 133 471H and 077 133 471HX
Seekpart24.com claims they both refer to Bosch no:0 986 280 213. Is this Correct?

Engine code AQH

Any thoughts would be very appreciated

Jan