Audi's best-selling lineup offers three body styles: sedans, Avant wagons, and Cabriolet convertibles. All are available in A4 and high-performance S4 trim. The A4 2.0 T sedan and wagon have a 200-hp turbo 4-cyl engine. The A4 3.2 sedan and wagon have a 255-hp V6. Cabriolets have either a 170-hp turbo 4-cyl or a 220-hp V6. S4s have a 340-hp V8. Audi's quattro all-wheel drive is standard on wagons, S4s, and the 3.0 Cabrio. It's available for other models in place of front-wheel drive. Transmission choices, depending on model, include a manual, automatic, or a continuously variable transmission (CVT) that provides near-infinite drive ratios.

Sporty S line packages include 18-inch wheels, plus a firmer, lower-riding suspension. S4s have unique trim and sport suspension. All A4s have ABS and an antiskid system. Sedans and wagons include curtain side airbags and front torso side airbags; rear torso airbags are available. Cabrios come with front head/torso side airbags, plus rear support bars designed to pop up in a rollover. Cabrios have a power fabric top with heated glass rear window. Optional is a navigation system that includes Audi's MMI integrated control for audio, climate, and other functions.