Eng began his motorsport career in 2003 in karting , which he practiced until 2005. 2006 Eng made in the German Formula BMW his first experience in Formula racing and finished tenth in the standings. He also took part in two British Formula BMW races. In 2007, Eng stayed in the German Formula BMW and finished third in the overall standings with a victory. Eng also won the Formula BMW world final and a Formula 1 test drive with BMW Sauber , which he completed in December 2008. In the 2008 season, Eng was active in the German Formula 3 Cup and finished eleventh overall. He also made guest appearances in the European Formula BMW.
Philipp Eng at the 2012 season finale in Hockenheim
In 2009 , Eng started in the revived Formula 2 . After finishing on the podium twice on the first two race weekends, he won his first race in the championship at Brands Hatch . In the overall standings he finished eighth overall at the end of the season. In 2010 Eng returned to Formula 2 and was one of the title favorites before the season. Although he started the new season well with two wins on the first two race weekends, in the further course of the season he no longer lived up to his role as a favorite and only scored one more victory. He finished his second season in Formula 2 in sixth place in the overall standings.
In 2011 , Eng switched to GT racing and started for Callaway Competition together with Toni Seiler in the ADAC GT Masters . The two finished the season in 39th place in the drivers' championship. In 2012, Eng only drove in six of sixteen championship races with Fredy Barth for MRS GT-Racing, but still finished one race in the points.
Eng has been driving in the DTM for BMW since 2018 . He came on the podium for the first time in the third championship round at the Lausitzring . In the 2019 season, he won his first DTM victory in round four in Zolder, Belgium . He was also on the podium two more times. He finished the 2019 season in sixth place overall. In December 2019 it was announced that he will also be part of the BMW driver line-up for the 2020 season.