9. Audi A4 B6 CVT (Worst)
The Audi A4 B6 (2001-2005) equipped with the Multitronic CVT transmission quickly gained a reputation for mechanical headaches. Owners experienced frequent and expensive transmission failures, often resulting in hefty repair bills or full replacements. This notorious reliability issue tarnished the reputation of an otherwise well-regarded A4 generation. For many, the B6 CVT stands as a warning about the risks of early CVT technology and remains one of Audi’s most regrettable drivetrain decisions. Read more