After the 1990 IndyCar season proved to be a backward step he returned to the series in 1991 with Tom Walkinshaw Racing/Silk Cut Jaguar in the No. 34 Jaguar XJR-12 and Jaguar XJR-14. Fabi won the Castrol BRDC Empire Trophy at the Silverstone Circuit with Derek Warwick. At the 24 Hours of Le Mans in the team's Jaguar XJR-12-Jaguar 7.4L V12 with Bob Wollek and Kenny Acheson for the C2 class. In the race the car started twenty-seventh and finished third with 358 laps complete. Fabi went on to win the World Endurance Championship for Drivers with 86 points.