The engine offered solid mid-range power and relatively good fuel economy for its size and output, making it an attractive choice for those looking for performance combined with the luxury and comfort of the audi a6. However, like any vehicle, the audi a6 c6 3. Fsi had potential mechanical and electrical issues. Audi a6 (c6) 3. Fsi 265 hp.What year Audi A6 should I stay away from? The 2000–2002, 2005–2006, and 2012 model years are the most commonly flagged by owners and reliability surveys. They suffer from electrical faults, airbag sensor failures, and widespread oil consumption issues.Coupe quattro is powered by a 3189 cc petrol engine mated to a 6 gears speed automatic gearbox which generates 250of power & 320of torque. audi a3 quattro hatchback 3.