The Mark 2 series is the longest running Jetta so far. Introduced to Europe in early 1984 and to North America in 1985, the second generation Jetta proved to be a sales success for Volkswagen. The car secured the title of best-selling European car in North America, Farmers Journal COTY 1991 and outsold the similar Golf by two-to-one in that market. Based on the all new second generation Golf platform, the car was larger, heavier, and could seat five people instead of four as in the Mark 1. Exterior dimensions increased in all directions. Overall length was up by 100 millimetres (3.9 in), the wheelbase grew 66 millimetres (2.6 in), and the width went up 53 millimetres (2.1 in). The suspension setup was basically unchanged from the first generation, although refined slightly, for example by the inclusion of a separate subframe for mounting the front control arms to help noise isolation, as well as improved rubber mountings for all components. Aerodynamics improved considerably, with a drag coefficient of 0.36. With a 470-litre (16.6 ft3) luggage compartment, the trunk had grown nearly as large as some full-sized American sedans. Interior room was also increased 14%, which changed the EPA class from sub-compact to compact.
Cars built in Germany were assembled in a brand new (at the time) plant at Wolfsburg in Assembly Hall 54. The plant was heavily robotised in an effort to make build quality more consistent. New innovations on the second generation included an optional trip computer (referred to as the MFA, German Multi-Funktions-Anzeige), as well as silicone dampened engine and transmission mounts to reduce noise, vibration, and harshness levels. In 1988, a more advanced fully electronic fuel injection system became available. This arrangement is known as the Digifant Engine Management system.