From 1986 to 1988, he won the German OMK Motocross Cup of the Southern Group in the 125 cc class three times.

In 1991, Abt won the Formula BMW Junior with a 29-point lead over the later rally driver Lars Mysliwietz.

Abt remained in formula racing until 1995 but was unable to achieve notable success compared to his first years.

In 1996, he switched to touring cars and finished fourth in the family-owned racing team in the Super Tourenwagen Cup.

However, 24 days later, the DMSB Sports Court decided not to count the last lap of the race, awarding the championship to Abt.

However, the performance of the Audi TT-R was significantly disadvantaged compared to the factory-built AMG Mercedes CLK-DTM and Opel Astra V8 Coupé.

In June 2017, Abt ended his three-year career as a city councillor for the Free Voters in Kempten.

His wife, Margit Abt, was active in the Ford Fiesta Mixed Cup and the Seat Leon Supercopa.