Over time, your car’s throttle body can get a build-up of carbon deposits, which can lead to issues such as rough idle, poor acceleration, and decreased fuel efficiency. From time-to-time, it’s a good idea to clean your throttle body to improve the performance of your vehicle. On the 2000-2006 Audi TT, the throttle body is located at the front of the engine bay close to the passenger side, so it is easily accessible.