He landed the second seat (alongside Austrian Karl Wendlinger) at the new, much-anticipated Sauber team for 1993, running Ilmor engines. The season started very well as Lehto survived a late downpour at Kyalami to score 5th place on the team's debut, then finished 4th at Imola despite a late engine failure. However, after a collision with Wendlinger at Monaco his relationship with both his teammate and Sauber became frosty and his season tailed off with no more points scored.