Danner returned to Zakspeed in . The car was both un-competitive and often unreliable and when Danner finished a race it was always outside the points. After having raced touring cars in 1988, Danner returned to Formula one in with Rial Racing. The car was highly uncompetitive and a fourth place due to a high attrition rate at the 1989 United States Grand Prix was the only highlight of the year. Danner was fired after the Portuguese Grand Prix after only qualifying for four races that year.