Engine Number

WARNING: This page is about a different car, the 2010 Audi Q7, 2009 Audi Q7, 2008 Audi Q7, and 2007 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

Engine number ("engine code" and "serial number") is located at front near crankshaft ribbed belt pulley -arrow-.

Fig 1: Locating Engine Number
Courtesy of AUDI OF AMERICA, LLC
In addition, a sticker with "engine code" and "serial number" is affixed to back of cylinder head cover.
The engine code is also located on the vehicle data plate.

NOTE:

Engine code is also stamped on right engine lifting eye.