2003 Ford Focus Light Bulbs Types:
| Bulb | Type |
| Headlamps (VOR) | HB2 |
| Headlamps (high beam, VOL) | H7 |
| Headlamps (low beam, VOL) | D2S |
| Park lamp (front, VOL) | W5W |
| Turn lamp (front, VOL) | 3457K |
| Park and turn lamp (front) | 3157K |
| Side marker lamp (front) | GE194 |
| Foglamps (if equipped) | 899 |
| Stop/turn and tail lamps | 3157K |
| Backup lamp (sedan/wagon) | 3156K |
| Backup lamp (coupe) | 921 |
| License plate lamp | C-5W |
| High-mount brakelamp | W5W |
| Dome lamp (front/rear) | 12V10W |
| Map lamp | 12V6W |
| Luggage compartment | 12V10W |
