Audi A4 2.0 4 CYL Petrol Engine (ALT)

The Audi ALT engine number refers to a specific 2.0L 20V gasoline engine code used in various Audi models, particularly the A4 (B6). The engine code “ALT” identifies this particular engine type, and it’s often found in the vehicle’s maintenance or service booklet, or on a sticker in the trunk, typically near the spare tire.