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. 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.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’s new 3. L DOHC V-6 is first North American application of the auto maker’s FSI gasoline direct-injection technology.Pre 2006 had some timing chain tensioner issues which are expensive to fix. Other than that they’re very reliable engines. Mine doesn’t burn or leak a drop of oil but maybe some do. These 3. L V6 engines are gems. My 07 automatic doesn’t miss a beat with almost 240k miles on it now. I’ve owned it for almost 9 years and ragged on it like crazy for all of them. No problems at all yet on the original engine/transmission.