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| The engine number („Engine code“ and „Serial number“) -arrow- can be found on the left side (seen in the direction of travel) at the joint between engine and gearbox. |
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| Additionally there is a sticker on the toothed belt cover showing the „engine code“ and „serial number“. |
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| Starting with the letter „C“, the engine codes consist of 4 letters. |
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| The first 3 characters of the engine code stand for the engine capacity and the mechanical construction and design. They are stamped on the cylinder block, together with the serial number. |
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| The 4th character indicates the power output and torque of the engine, and is determined by the engine control unit. |
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| The 4-character engine code can be found on the type plate (in versions for some countries only) and on the vehicle data sticker and the engine control unit. |
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| Fitting locations of the type plate for the Audi A5 Coupé (certain countries only) and the vehicle data sticker → Booklet811. |
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| Fitting locations of the type plate for the Audi A4 (certain countries only) and the vehicle data sticker → Booklet812. |
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| Fitting locations of the type plate for the Audi A5 Cabriolet (certain countries only) and the vehicle data sticker → Booklet818. |
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