For 1994 he saw off competition from Michele Alboreto and Luca Badoer to land the second seat at Benetton alongside Michael Schumacher. However, he injured his neck testing the new B194 in pre-season with test driver Jos Verstappen taking his place for the first two rounds of the championship. Lehto returned to the cockpit for the ill-fated San Marino Grand Prix despite some question marks over his fitness. He qualified 5th but stalled on the grid, his car being struck from behind by Pedro Lamy's Lotus. Despite running 3rd in Spain before an engine failure and scoring a point in Canada (after the disqualification of Christian Fittipaldi) it was clear his injuries had not healed fully and he was replaced once again by Verstappen for the French Grand Prix. He returned to the cockpit for the Italian and Portuguese rounds in place of the suspended Schumacher but did not impress and was released entirely soon afterwards when the team signed Johnny Herbert. This freed him up to drive in the last two rounds for Sauber – Wendlinger's injuries from an accident in practice before the 1994 Monaco GP had failed to heal and his previous replacement Andrea de Cesaris was unreachable.