2003 Honda Civic bulb fitment starts with a 9003 bulb for both the low-beam and high-beam headlights. The supplied data does not list a separate fog-light bulb or identify a projector/non-projector headlight variation, so confirm the existing bulb before ordering.
- Front lighting: Front turn signals use 7440A, or 7443 on Coupe models. Parking lights use 168 or 917.
- Rear lighting: Tail lights may use 168, 917, or 7443R; Hatchback applications also list 7528. Rear turn signals are 3156 for Coupe models and 7440 for Hatchback models.
- Brake and center stop lights: Coupe models list 7443R for the brake light and 7440 for the center stop light. Hatchbacks list 7528 for the brake light and 2825 or 98 for the center stop light.
- Reverse lights: The data lists 921, plus 7506 for Hatchback and 7440 for Sedan applications.
- Interior and other bulbs: The dome light uses DE3175. Map-light fitment varies, with DE3175 listed for Coupe and 2825 or 98 for Hatchback. License-plate and trunk lights use 168 or 917.