The 2003 Toyota Indy 400 was Round 15 of the 2003 IndyCar Series. The event was held at Auto Club Speedway in Fontana, California, United States on 21 September 2003. Helio Castroneves started on pole position and Sam Hornish Jr. was the race winner.
TOYOTA INDY 400 Race Result
| Pos. | No. | Driver | Chassis | Engine | Tire | Started | Laps | Total Time | Laps Led | Status | Points | Avg. Speed | Pit Stops |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 4 | Sam Hornish Jr. | Dallara | Chevrolet | Firestone | 10 | 200 | - | 30 | Running | 50 | 207.151 | - |
| 2 | 9 | Scott Dixon | G-Force | Toyota | Firestone | 3 | 200 | - | 13 | Running | 40 | - | - |
| 3 | 11 | Tony Kanaan | Dallara | Honda | Firestone | 5 | 200 | - | 0 | Running | 35 | - | - |
| 4 | 26 | Dan Wheldon | Dallara | Honda | Firestone | 4 | 200 | - | 0 | Running | 32 | - | - |
| 5 | 10 | Tomas Scheckter | G-Force | Toyota | Firestone | 7 | 200 | - | 112 | Running | 32 | - | - |
| 6 | 3 | Helio Castroneves | Dallara | Toyota | Firestone | 1 | 200 | - | 39 | Running | 28 | - | - |
| 7 | 55 | Roger Yasukawa | Dallara | Honda | Firestone | 16 | 200 | - | 0 | Running | 26 | - | - |
| 8 | 8 | Scott Sharp | Dallara | Toyota | Firestone | 19 | 199 | - | 0 | Running | 24 | - | - |
| 9 | 31 | Al Unser Jr. | Dallara | Toyota | Firestone | 15 | 199 | - | 0 | Running | 22 | - | - |
| 10 | 52 | Alex Barron | Dallara | Chevrolet | Firestone | 9 | 199 | - | 5 | Running | 20 | - | - |
| 11 | 2 | Vitor Meira | Dallara | Chevrolet | Firestone | 6 | 199 | - | 0 | Running | 19 | - | - |
| 12 | 24 | Robbie Buhl | Dallara | Chevrolet | Firestone | 22 | 198 | - | 0 | Running | 18 | - | - |
| 13 | 18 | Ed Carpenter | Dallara | Chevrolet | Firestone | 17 | 198 | - | 0 | Running | 17 | - | - |
| 14 | 13 | Greg Ray | G-Force | Honda | Firestone | 13 | 198 | - | 0 | Running | 16 | - | - |
| 15 | 6 | Gil de Ferran | G-Force | Toyota | Firestone | 12 | 198 | - | 0 | Running | 15 | - | - |
| 16 | 21 | Felipe Giaffone | G-Force | Toyota | Firestone | 8 | 196 | - | 0 | Running | 14 | - | - |
| 17 | 14 | A.J. Foyt IV | G-Force | Toyota | Firestone | 20 | 195 | - | 0 | Running | 13 | - | - |
| 18 | 12 | Tora Takagi | G-Force | Toyota | Firestone | 11 | 195 | - | 0 | Running | 12 | - | - |
| 19 | 23 | Sarah Fisher | Dallara | Chevrolet | Firestone | 18 | 194 | - | 0 | Running | 11 | - | - |
| 20 | 15 | Kenny Brack | Dallara | Honda | Firestone | 2 | 185 | - | 1 | Running | 10 | - | - |
| 21 | 91 | Richie Hearn | Dallara | Chevrolet | Firestone | 21 | 133 | - | 0 | Handling | 9 | - | - |
| 22 | 27 | Bryan Herta | Dallara | Honda | Firestone | 14 | 88 | - | 0 | Handling | 8 | - | - |