Two engines have been available in the redesigned A4 series. In 1.8T models, a turbocharged 1.8-liter four-cylinder engine produced 170 horsepower. A 3.0-liter V6 that makes 220 horsepower went into 3.0 models. Four-cylinder models could have a five-speed manual or five-speed automatic transmission, or Audi's continuously variable transmission (CVT). Choices for the V6 were similar, but with a six-speed manual gearbox ratherthan the five-speed. For 2002 only, Audi continued to offer previous-generation S4 models with a 250-horsepower turbocharged V6 engine. Quattro all-wheel drive was available on all models except the Cabriolet, which was added for 2003 and initially came only with front-wheel drive. High-performance S4 models returned for 2004 with a 340-hp, 4.2-liter V8 engine and six-speed manual or automatic transmission.

Vehicle crash test information not available at this time.