Number plate lights are straightforward bulbs you can swap yourself in 10 to 15 minutes

Number plate lights sit in small housings above or below your rear license plate and illuminate it so the plate is readable at night. Most cars have two of them, one on each side of the plate. The bulbs inside burn out like any other light, and you can replace them yourself without special tools—just a screwdriver that fits the housing screws, a replacement bulb of the correct type, and a few minutes of your time.

The whole job takes longer to read about than to do. You'll remove the light housing from the bumper or body panel, take out the old bulb, insert the new one, and screw the housing back in place. No wiring, no electrical knowledge needed.

Key Takeaways

  • Number plate light bulbs are usually 194, 168, or 501 type bulbs—check your owner's manual or the old bulb itself to find the right replacement.
  • The housing is held in with one or two small screws that you remove with a Phillips or flathead screwdriver, depending on your car.
  • Pull the housing straight out once the screws are loose, then twist the bulb counterclockwise to remove it from the socket.
  • Insert the new bulb by twisting it clockwise until it stops, then screw the housing back into place and test the light before you finish.

Find the correct bulb type for your car

The bulb type varies by vehicle year and model. Your owner's manual lists the correct bulb in the maintenance or specifications section—look for "license plate light" or "number plate light." If you don't have the manual, you can also check the old bulb itself: the type number is printed on the base. Common types are 194, 168, 501, and W5W, but yours may be different.

Buy the replacement bulb before you start. Most auto parts stores stock these bulbs for $3 to $8 each. LED replacements cost more but last longer and draw less power from your battery. Either type works fine; LED is optional, not necessary.

Remove the light housing from the bumper or panel

Locate the number plate light housing—it's the small rectangular or round fixture mounted directly above or below your license plate. Look at it from outside the car to see where the screws are. Most housings have one or two screws on the outside face, though some cars have the screws on the inner edge where the housing meets the bumper.

Use a Phillips or flathead screwdriver (whichever fits the screw head) to remove the screws. Turn counterclockwise and set the screws somewhere you won't lose them—a small cup or your pocket works. Once the screws are out, gently pull the housing straight toward you. It should come free without resistance. If it doesn't, check that you've removed all the screws and that no wiring is caught.

Take out the old bulb and insert the new one

Inside the housing you'll see a socket with the bulb pushed into it. Grasp the bulb gently and twist it counterclockwise—it will turn about a quarter turn before it stops and comes free. Don't pull straight out; the twist-and-pull motion is what releases it from the socket.

Take the new bulb and insert it into the socket. Push it in gently and twist clockwise until it stops. You'll feel a slight resistance as the tabs on the bulb align with the slots in the socket. Don't force it; if it doesn't turn smoothly, remove it and try again. Once it's seated, the bulb should be snug and not wiggle.

Reinstall the housing and test the light

Push the housing straight back into the bumper or panel until it sits flush. The screw holes should line up with the holes in the car body. If they don't, remove the housing and rotate it slightly, then try again.

Insert the screws and turn them clockwise until they're snug. Don't overtighten—you only need enough pressure to hold the housing in place. Overtightening can crack the plastic housing or strip the screw holes. Once both screws are in, sit in the driver's seat, turn on the headlights or parking lights, and look in the mirror or walk around the back to confirm the number plate light is on. If it's not, turn off the lights, remove the housing again, and check that the bulb is twisted all the way in.

Common mistakes to avoid

The most frequent error is not twisting the bulb far enough when reinstalling it. The bulb will look like it's in the socket, but the electrical contact won't be complete and the light won't turn on. Always twist until you feel it stop and the bulb is snug.

Another mistake is pulling the housing too hard before the screws are fully removed. This can break the plastic tabs that hold the socket in place. Always remove all visible screws first and check the inner edges of the housing for hidden screws before you pull.

Don't touch the glass or metal of a halogen bulb with your bare fingers. Skin oils can cause the bulb to overheat and fail early. If you touch it, wipe it clean with a dry cloth before installing it. LED bulbs don't have this issue.

What to do if the light still doesn't work

If you've installed a new bulb and the light doesn't turn on, first confirm the bulb is the correct type for your car. Remove the housing again and check that the bulb is twisted all the way in—it should not move or wiggle. Reinstall it and test again.

If the light still doesn't work, the socket itself may be damaged or corroded. Look inside the housing for white or green corrosion around the socket contacts. If you see corrosion, you can try cleaning the contacts gently with a dry cloth or a pencil eraser, then reinstalling the bulb. If that doesn't work, the housing may need to be replaced as a unit—your car's parts supplier can order a new one for $15 to $40.

It's also possible the wiring to the light has failed, though this is rare. If you've tried a new bulb and cleaned the socket and the light still doesn't work, a mechanic can test the wiring with a multimeter to confirm whether power is reaching the socket.

Frequently Asked Questions

Can I use any bulb type, or does it have to match my owner's manual?

Use the type listed in your manual or printed on the old bulb. Using the wrong type can cause the light to be too bright or too dim, draw too much power, or not fit the socket at all. The correct type is inexpensive and widely available, so there's no reason to guess.

Do I need to disconnect the battery before changing the bulb?

No. Number plate lights draw very little power, and you're not working with the main electrical system. straightforward turning off the lights is enough. You don't need to disconnect the battery or remove any fuses.

What if I can't find the screws on my number plate light housing?

Some cars have the screws on the inner edge of the housing, where it meets the bumper or body panel. Look carefully at all edges of the housing, including the top, bottom, and sides. If you still can't find them, check your owner's manual for the specific location on your model, or take a photo and ask a parts supplier or mechanic.

Is it better to use LED or halogen bulbs for number plate lights?

Either works. LED bulbs last longer, draw less power, and run cooler, but they cost more upfront. Halogen bulbs are cheaper and work just as well for the short time they're on each day. Choose based on your budget and how often you want to replace the bulb.

How often do number plate lights burn out?

Halogen bulbs typically last two to four years with normal use, since the light is only on when the car is parked at night or when headlights are on. LED bulbs last much longer, often 10 years or more. You'll likely replace them only once or twice during the life of the car.