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Engine identification

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Engine identification is visible first after preparations.

Fig 1: Removing Front Engine Cover

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove front engine cover (arrows).

Fig 2: Identifying "Engine Code" And "Production Number" Location

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

A sticker containing "engine code" and "production number" (arrow) is located on the housing for vacuum diaphragm for intake manifold adjustment.

If the sticker is not present and the "engine identification" is required, proceed as follows:

Fig 3: Removing Rear Engine Cover

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove rear engine cover (arrows).

Fig 4: Identifying Engine Codes Are Stamped On Rear Of Cylinder Block, Left Side

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Engine codes are stamped on rear of cylinder block, left side (arrow).

Engine codes are also included on the vehicle data plate.

If the sticker is not present and the "engine identification" and "production number" is required, proceed as follows:

Fig 5: Removing Bolts And Vacuum Diaphragm For Intake Manifold Adjustment

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove bolts (arrows) and remove vacuum diaphragm for intake manifold adjustment.
Remove compression spring which is behind it and set off to side vacuum diaphragm with connected lines.

Fig 6: Identifying Engine Code Are Located At The Front Of The Cylinder Head, On Top

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Courtesy of VOLKSWAGEN UNITED STATES, INC.

The engine code -arrow- ("engine code" and "production number") are located at the front of the cylinder head, on top.