The 126C3 was first introduced for the British Grand Prix at Silverstone in 1983, with Patrick Tambay, while Arnoux would get to drive a 126C3 at the subsequent race in Germany at Hockenheim, which he ended up winning. Postlethwaite kept the oversized rear wing of the 126C2B, and over the season, Frenchmen Patrick Tambay and René Arnoux scored four wins between them and were both in contention for the world championship throughout 1983, but late unreliability cost them both. However, Ferrari took the constructors' title for the second year in a row.