As a member of the Red Bull Junior Team, after Christian Klien was dropped by the Red Bull Racing Formula One team for the final three races of the season, the team's third driver, Robert Doornbos, was promoted to the second race seat. This left a vacancy in the team, and Ammermüller was promoted to the position of third driver for the last three races of the season. He tested the car for the first time on 14 September, driving the distance necessary for an FIA Super Licence.