Michael Ammermueller entered the world of professional racing in the year 2000, taking his kart racing, initially a hobby, seriously. He participated in the European Kart championships, racing in the ICA Juniors category. Proving his skill, Ammermueller grabbed the overall championship title in his first attempt itself. This was followed by a second place finish in the German Kart championship’s Formula A Series, in 2001.
The next year in the World Championships, Ammermueller participated in the Super A category and was soon noticed for his skill. Even though he finished in 7th place, his talented driving was better appreciated. In 2003, Michael participated in the Super ICC Series, which is a part of the World Kart championships, and finished in 5th place in the series.
His impressive performance resulted in a call from Formula Renault FR 2.0 Germany Series, and Ammermueller made the most of this opportunity. He finished in third place in the series and in 2005 he had graduated to Italy, where he appeared in the Formula Renault 2.0 Series, as well as the Formula Renault Eurocup. Ammermueller ended the year with a total of nine race wins and was soon noticed by the big guns.
The very next year, he moved into the Formula One feeder series, the GP2 championships. Ammermueller finished in the 11th place, with one race win under his belt. Further, Ammermueller was made the test driver for the Red Bull Formula Racing team in the Friday practice sessions for the Japanese, Brazilian and Chinese Grands Prix. By the end of 2006, Ammermueller had tested for the A1 Team Germany, during the 2006-07 season of the A1 GP World Cup of Motorsports.
2007 was an extremely busy year for Ammermueller, and before he started testing for the A1 Team Germany, he also tested for the Red Bull Racing Formula One team, for the 2007 season. Ammermueller further participated in the GP2 series, and the Formula Renault World Series, where he only participated in a few races due to an injury.