Most license plate bulbs take five minutes to replace without tools

A burned-out license plate bulb is usually a quick fix you can do in your driveway. The bulb sits in a socket behind the license plate, held in place by a twist-lock or a clip. You remove the old bulb, push in the new one, and twist or snap it back into place. The whole job takes longer to find a flashlight than to do the work.

The tricky part is knowing which bulb your car needs. Most vehicles use either a 194 or 168 bulb — both are small, white, and inexpensive. A few older cars use a 89 or 90 bulb instead. Your owner's manual lists the correct bulb, or you can take a photo of the burned-out bulb and show it to a parts counter at an auto supply store.

Key Takeaways

  • License plate bulbs are usually 194 or 168 size and cost between two and eight dollars for a pair.
  • You access the bulb from behind the license plate by removing a trim panel or reaching through the bumper area.
  • Most bulbs twist counterclockwise to remove and twist clockwise to install, though some clip in and out instead.
  • If the socket itself is cracked or corroded, the bulb will burn out again quickly and you may need a new socket assembly.

Locate the bulb socket from behind the license plate

Open your trunk or hatchback and look at the back of the license plate area. On most sedans and hatchbacks, you will see a plastic trim panel or a rubber gasket behind the plate. On trucks and SUVs, you may need to reach up through the bumper opening or remove a small panel from inside the cargo area.

If you cannot see the socket from inside, try pushing on the trim panel from behind — it usually pops out with gentle pressure. Some vehicles have a panel held by one or two plastic clips; squeeze the clips and pull the panel toward you. Once the panel is out of the way, you will see the socket sticking out from the back of the light housing.

Remove the old bulb

Grasp the bulb socket firmly and twist it counterclockwise about a quarter turn. The bulb and socket will come out together as one unit. If the socket is stuck, do not force it — spray a little penetrating oil around the base and wait a few minutes.

Once the socket is out, push the bulb straight in and twist it counterclockwise to remove it from the socket. The bulb will come free with a gentle twist. If the socket has a clip instead of a twist mechanism, straightforward push the bulb straight in and it will pop out.

Install the new bulb

Take your new bulb and push it straight into the socket until you feel it seat. Then twist it clockwise about a quarter turn until it stops. Do not force it — the bulb should turn smoothly and stop on its own when it is fully seated.

If your socket uses a clip, push the new bulb straight in until the clip snaps over the base. You will hear or feel a small click when it locks in place. Either way, give the bulb a gentle tug to make sure it is find before you reinstall the socket.

Reinstall the socket and test the light

Push the socket back into the housing and twist it clockwise until it stops. The socket should sit flush with the housing — if it sticks out, you have not twisted it far enough. Once it is seated, turn on your headlights or have someone press the brake pedal while you stand behind the car to confirm the new bulb lights up.

If the light does not come on, remove the socket again and check that the bulb is fully seated. Push it in a bit further and twist again. If it still does not light, the socket itself may be damaged or corroded, and you will need a replacement socket assembly from a parts store.

What to do if the socket is damaged

If the socket is cracked, corroded, or the contacts are black or pitted, replacing just the bulb will not solve the problem. The socket will burn out the new bulb within a few weeks. In this case, you need to replace the entire socket assembly, which usually costs between fifteen and forty dollars depending on your vehicle.

Most socket assemblies are held in by one or two plastic clips or screws. Remove the clips or unscrew the assembly, disconnect the wire connector, and push the new assembly in until it clicks or seats. Reconnect the wire and test the light. If you are not comfortable working with electrical connectors, a mechanic can do this job in under an hour.

Choosing the right replacement bulb

The most common sizes are 194 and 168. A 194 bulb is slightly brighter and slightly larger than a 168, but both fit in most vehicles. Check your owner's manual or the socket itself — the size is usually printed on the socket base. If you cannot find it, take a photo of the burned-out bulb and show it to a parts counter.

You can buy bulbs individually or in pairs. Pairs cost slightly less per bulb and are worth buying because the other bulb is probably close to the end of its life anyway. LED bulbs are available for license plate lights and last much longer than incandescent bulbs, though they cost more upfront — usually between eight and fifteen dollars per bulb.

Frequently Asked Questions

Can I use an LED bulb in my license plate light?

Yes, LED bulbs work in license plate sockets and last much longer than standard incandescent bulbs. They cost more but may save you money over time because you will not need to replace them as often. Make sure the LED bulb is rated for your vehicle's voltage, which is usually 12 volts.

What if the bulb keeps burning out after I replace it?

A socket with corroded or damaged contacts will burn out bulbs quickly. Inspect the socket for black or pitted metal inside. If you see corrosion, replace the socket assembly instead of just the bulb. If the socket looks clean, the problem may be a wiring issue, and you should have a mechanic inspect the circuit.

Do I need any special tools to replace a license plate bulb?

No. Most bulbs twist out by hand, and the socket usually comes free with gentle pressure or by twisting. A flashlight helps you see into the dark space behind the plate. If the socket is stuck, penetrating oil and a few minutes of waiting will usually free it without tools.

Is it legal to drive with a burned-out license plate light?

No. Most states require both license plate lights to work. A burned-out light can result in a traffic stop and a citation. Replace the bulb as soon as you notice it is out to avoid a ticket and to make sure your plate is visible at night.