Touring car
Born in Kempten im Allgäu, Engstler started racing in the European Hillclimbing Championship and the German Long Distance Cup, which he won. From 1988 he competed in German Formula Three, winning the class B title in 1989. In 1993 he switched to Touring car racing, where he was German Touring Car Championship Class 2 champion in an Alfa Romeo 155. Between 1994 and 1999, he raced in the German Super Touring Championship for various teams. He finished first in the 2000 German Touring Car Challenge, with two wins. Two more seasons were spent racing in this series in 2002 and 2003.