Engine Identification

For A8 models with the 3.7L V8 or 4.2L V8 engine and Engine Codes AEW and ABZ the engine code letters and serial number are stamped on the left side of the cylinder block (arrow), directly above the power steering pump. See Fig 1 . In addition, an adhesive label with engine code letters and serial number is affixed to the toothed belt guard. The engine code letters are also listed on the vehicle data plate.

Fig 1: Locating Engine Code (3.7L AEW & 4.2L ABZ)

Courtesy of AUDI OF AMERICA, INC.

For A8 models with the 4.2L V8 models with Engine Code AKB and AUX and S8 4.2L V8 models with Engine Code AYS, the engine code and serial numbers located on the left side of the cylinder block. See Fig 2 . The engine number is also listed on a label on the belt cover. The engine code is included on the vehicle data label.

Fig 2: Locating Engine Code (4.2L AKB, AUX & AYS)

Courtesy of AUDI OF AMERICA, INC.