If you own a 2011–2018 Audi A6 (C7 or 4G chassis), you already know the dichotomy of the experience. On one hand, you have a masterpiece of German engineering: a supercharged V6, a sumptuous interior, and quattro all-wheel drive that laughs at rain. On the other hand, you have a complex network of sensors, electronic parking brakes, and timing chains that can make a trip to the dealership feel like a second mortgage.
That key is the