The Toyota TF103 was designed by Gustav Brunner and used during the 2003 Formula One Season. It was piloted by Olivier Panis and Cristiano da Matta, the reigning CART FedEx Championship Series Champion from 2002. Powering the engine was a Toyota RVX-03 which was mated to a six-speed semi-automatic gearbox. It had Michelin tires and fueled by Esso fuel. The TF103 was lighter than its predecessor, the TF102, and had more downforce.

The car was a joint effort between Gustav Brunner's design team and Keizo Takahashi, chief of Technical co-ordination.

For 2003, the TF103 scored 16 points and carried the team to an 8th place finish in the Constructors' Championship.

by Dan Vaughan