1. Locate the number plate light fixture. It is located on the underside of the trunk lid, near the license plate.
2. Remove the screws that hold the light fixture in place. There are two screws, one on each side of the light fixture.
3. Pull the light fixture out of the trunk lid. Be careful not to drop the bulb.
4. Remove the old bulb from the light fixture. Twist the bulb counterclockwise to remove it.
5. Insert the new bulb into the light fixture. Twist the bulb clockwise to secure it in place.
6. Reattach the light fixture to the trunk lid. Insert the screws into the holes and tighten them until they are snug.
7. Test the light fixture. Turn on the headlights and make sure that the number plate light is working.
Here are some additional tips:
* Make sure that you use the correct type of bulb. The number plate light bulb for a Fiat Stilo is a W5W bulb.
* Be careful not to touch the glass part of the bulb. This can cause the bulb to overheat and fail prematurely.
* If you are unable to change the number plate bulb yourself, you can take your car to a mechanic or auto parts store. They will be able to change the bulb for you for a small fee.
