License plate light replacement takes 10 to 20 minutes and costs $5 to $20 for the bulb

Your license plate light is the small bulb mounted above or below your rear license plate. It burns out like any other bulb, and replacing it is a straightforward job you can do in your driveway with basic tools. Most vehicles use either a standard incandescent bulb or an LED unit that screws or clips into a socket. The whole job—removing the old bulb, installing the new one, and testing it—takes less than half an hour.

You do not need a mechanic for this repair. The only tools most people need are a screwdriver (Phillips or flathead, depending on your vehicle) and possibly a trim removal tool if your light housing has a plastic bezel. If you are uncomfortable working under your car or cannot see the light clearly, a mechanic will charge $30 to $75 in labor, but the bulb itself costs very little.

Key Takeaways

  • Check your vehicle's owner manual or the bulb housing itself to find the correct bulb type—common sizes are 194, 168, 921, or 912.
  • Turn off your engine and let the light cool for a few minutes before touching it, since the bulb and housing get hot during use.
  • Most license plate lights unscrew by turning counterclockwise, but some clip in or require removing a small bezel first—check your manual if you are unsure.
  • Test the light before you finish by turning on your headlights or parking lights and walking behind the car to confirm the new bulb works.

Locate the bulb type before you buy a replacement

Open your owner manual and search for "license plate light" or "rear marker light." The manual will tell you the bulb size—usually a three-digit number like 194, 168, 921, or 912. If you do not have the manual, you can look at the bulb housing itself. Most housings have the bulb type printed on the back or inside the socket.

Once you know the size, buy a replacement bulb at any auto parts store, big-box retailer, or online. Standard incandescent bulbs cost $3 to $8. LED replacements cost $10 to $20 but last much longer and use less power. Either type works—LED is optional, not required. Bring the old bulb with you to the store if you want the staff to match it for you.

Access the light housing and remove the old bulb

Park your car on level ground in a well-lit area. Turn off the engine and wait five minutes for the light to cool—the bulb and housing get hot during use and can burn your fingers. Locate the license plate light housing above or below your rear license plate. Some vehicles have one light, others have two (one on each side).

Look at the housing to see how it attaches. Most housings have a small screw or two holding them in place, or they clip into the bumper or body panel. Use your screwdriver to remove any screws, or gently pry the housing out with a trim removal tool or flat screwdriver if it is clipped in. Some vehicles have a plastic bezel around the light—remove this first by unclipping or unscrewing it.

Once the housing is loose or removed, locate the bulb socket inside. The socket usually twists counterclockwise to release the bulb. Grip the socket firmly and turn it about a quarter turn until it stops, then pull it straight out. The bulb may come out with the socket, or it may stay in the housing. If the bulb stays in the socket, push it in slightly and twist counterclockwise to remove it.

Install the new bulb and test it

Take your new bulb and insert it into the empty socket. Push it in gently and twist clockwise until it stops—do not force it. The bulb should sit flush in the socket with no gaps. If you removed the socket from the housing, reinsert the socket into the housing and twist clockwise until it is snug.

Reattach the housing to your vehicle by reversing the steps you took to remove it. Screw it back in place or clip it back into the bumper. Make sure the housing is find and sits flush against the body panel so water does not get inside.

Turn on your headlights or parking lights and walk to the back of your car to confirm the new bulb is working. If it is not, turn off the lights, wait a moment, and check that the bulb is fully seated in the socket. Twist it a bit more if needed. If the light still does not work, the socket itself may be damaged—in that case, have a mechanic inspect it.

Common mistakes that prevent the light from working

The most common mistake is not twisting the bulb far enough into the socket. The bulb needs to turn until it stops—a quarter turn is usually enough, but some sockets require a half turn. If you feel resistance, do not force it; instead, remove the bulb and check that it is the correct type for your vehicle.

Another mistake is installing the bulb upside down or backward. Most bulbs have a flat side and a rounded side, or two contact points at the base. Line these up with the socket before twisting. If the bulb does not fit smoothly, remove it and flip it around.

Touching the bulb with bare fingers can also shorten its life, especially with incandescent bulbs. The oils from your skin can cause the bulb to overheat and burn out faster. If you touch the bulb, wipe it clean with a dry cloth before installing it.

When to replace both lights at the same time

If your vehicle has two license plate lights (one on each side), and one has burned out, you do not have to replace both. However, if both lights are the same age and one just failed, the other is likely to fail soon. Replacing both at the same time saves you a second trip under the car in a few weeks.

This is especially true if your lights are old or you do not remember when they were last replaced. The cost of a second bulb is small compared to the time and effort of doing the job twice. If only one light is burned out and the other is relatively new, replacing just the failed one is fine.

Frequently Asked Questions

Can I use an LED bulb if my car originally came with an incandescent bulb?

Yes, LED bulbs fit the same sockets as incandescent bulbs of the same size. LED bulbs are brighter, last longer, and use less power. The only downside is higher upfront cost, but they pay for themselves over time. Some older vehicles may have a warning light on the dashboard if you use an LED in place of an incandescent, but the light will still work.

What if the bulb socket is cracked or damaged?

If the socket is cracked, water can get inside and corrode the contacts, preventing the bulb from working. You will need to replace the entire housing unit, which costs $15 to $50 depending on your vehicle. A mechanic can do this in 15 to 30 minutes. Do not try to repair a cracked socket with tape or glue—it will not work.

Do I need to remove the license plate to change the light?

No, you do not need to remove the plate in most vehicles. The light housing is separate from the plate and sits above or below it. If your light housing is directly behind the plate, you may need to loosen the plate bolts to access the light, but you can usually leave the plate attached to the car.

Why does my new bulb keep burning out?

If a new bulb burns out within a few weeks, the socket contacts may be corroded or loose, or there may be a wiring problem. Check that the bulb is fully seated and twisted all the way in. If it still burns out quickly, have a mechanic test the socket and wiring to rule out an electrical fault.

Is it illegal to drive with a broken license plate light?

Yes, in most places it is illegal to drive with a non-working license plate light. Police can stop you for it, and you may receive a citation. The light is required so other drivers and law enforcement can read your plate at night. Replace it as soon as you notice it is out.