For many years, Heyer was associated with Zakspeed, racing their Group 2 Ford Escorts in the European Touring Car Championship (champion 1974) and the Deutsche Rennsport Meisterschaft (champion 1975 and 1976).
Heyer attempted two European F2 races in 1976, finishing sixth at the first Hockenheim race.
He failed to qualify for the second Hockenheim race and made no further attempts in F2.

In his single attempt at Formula One, he entered the 1977 German Grand Prix on 31 July 1977 with the second Penske car of the new German team ATS.
With little experience in single seaters and a bad car, he did not qualify.
He was the first reserve, meaning that he would get the chance to race if another driver dropped out; however, Heyer chose to start the race anyway, slipping out of the pits and joining the pack without the officials realising.
Only when his gearbox failed after 10 laps was it realised that Heyer should not have been competing, whereupon he was disqualified.
He never attempted another race in a single-seat car.
He is the only driver to be credited with a DNQ, DNF, and DSQ in the same race.
For many years, Heyer was associated with Zakspeed, racing their Group 2 Ford Escorts in the European Touring Car Championship (champion 1974) and the Deutsche Rennsport Meisterschaft (champion 1975 and 1976). Heyer attempted two European F2 races in 1976, finishing sixth at the first Hockenheim race. He failed to qualify for the second Hockenheim race and made no further attempts in F2.
In his single attempt at Formula One, he entered the 1977 German Grand Prix on 31 July 1977 with the second Penske car of the new German team ATS. With little experience in single seaters and a bad car, he did not qualify. He was the first reserve, meaning that he would get the chance to race if another driver dropped out; however, Heyer chose to start the race anyway, slipping out of the pits and joining the pack without the officials realising. Only when his gearbox failed after 10 laps was it realised that Heyer should not have been competing, whereupon he was disqualified. He never attempted another race in a single-seat car. He is the only driver to be credited with a DNQ, DNF, and DSQ in the same race.
Hans Heyer