Replacing a headlight takes 15 minutes to an hour depending on your car's design

Most headlight replacements are straightforward enough to do yourself without special tools or a mechanic visit. The process involves removing the old bulb, inserting a new one of the correct type, and testing it. Some cars require you to remove a plastic housing first; others let you reach the bulb from inside the engine compartment. The hardest part is usually identifying which bulb type your car needs, since the same socket can hold different styles.

Before you start, you will need to know your vehicle's year, make, and model. Write these down — you will use them to find the right replacement bulb. You will also need to know whether you are replacing a low-beam headlight, high-beam headlight, or fog light, since each uses a different bulb type.

Key Takeaways

  • Your owner's manual or the bulb packaging tells you the exact bulb type your car needs — do not guess, as the wrong bulb will not fit or will not work.
  • Most headlight bulbs cost between $15 and $50 each, and you can buy them at auto parts stores, big-box retailers, or online.
  • Some cars require removing a plastic housing or wheel well to reach the bulb; your owner's manual shows whether yours does.
  • After installing the new bulb, turn on your headlights to confirm both the new bulb and the existing one on the other side are working.

Find your bulb type before you buy

Open your owner's manual and search for "headlight bulb" or "light bulb specifications." The manual will list the bulb type by its code — common types include H11, H7, 9005, 9006, and 5202. Write down the code for the bulb you need to replace. If you cannot find your manual, search online for "[your year, make, model] headlight bulb type" and you will find the answer within seconds.

Once you have the code, go to an auto parts store like AutoZone, O'Reilly, NAPA, or Advance Auto Parts. Show the staff member the code and they will hand you the correct bulb. If you prefer to order online, Amazon, Walmart, and the auto parts retailers all sell headlight bulbs by type code. The bulb itself costs $15 to $50 depending on the brand and whether you choose a standard bulb or an upgraded LED or HID version.

Do not buy a bulb based on the socket shape alone. Two bulbs can look similar but have different electrical connections inside. Using the wrong bulb will either not fit, not light up, or damage your car's electrical system.

Access the headlight housing

Open your hood and look at the back of the headlight assembly on the side you need to replace. You will see either a bulb socket sticking out from the back of the housing, or a plastic cover that needs to be removed first. Your owner's manual will show which applies to your car.

If there is a bulb socket visible, you can skip ahead to the next section. If there is a plastic cover, you will need to remove it. The cover is usually held in place by one or two plastic clips or screws. Gently pull the clips outward or unscrew the fasteners, then lift the cover away. Set it aside somewhere safe — you will reinstall it after the bulb is replaced.

On some vehicles, you may need to remove the wheel well liner or even the entire wheel to reach the headlight housing. This is less common on newer cars. If your manual indicates this is necessary, use a jack to lift the car safely, remove the wheel, and then unclip or unscrew the plastic liner. Always use jack stands if you are working under a raised vehicle.

Remove the old bulb and install the new one

Grasp the bulb socket firmly and twist it counterclockwise. The socket will pull straight out of the housing. Do not pull on the bulb itself — always grip the socket. Once the socket is out, push the bulb straight back into the socket to release it. The bulb will either twist out or pop straight out depending on the type.

Before you touch the new bulb, check whether it is a halogen bulb. If it is, wear a clean cloth or latex glove when handling it. Skin oils on a halogen bulb can cause it to overheat and fail early. If you have already touched it with bare skin, wipe it clean with a cloth.

Insert the new bulb into the socket. It will either twist in clockwise or push straight in, depending on the type. You will feel it seat fully when it is installed correctly. Do not force it — if it does not go in smoothly, you may have the wrong bulb type. Check the code on the packaging against your manual.

Twist or push the socket back into the headlight housing until it seats completely. You should hear or feel a click. Reinstall any plastic covers or liners you removed, then close the hood.

Test both headlights before you finish

Sit in the driver's seat, turn on the ignition, and turn on your headlights. Get out and walk around the front of the car to confirm that both the new bulb and the existing bulb on the other side are lighting up. If the new bulb is not on, turn off the headlights, open the hood, and check that the socket is fully seated in the housing.

If the bulb still does not light after you have reseated it, the bulb itself may be defective. Take it back to the store where you bought it and ask for a replacement. Most retailers will swap a defective bulb on the spot.

If both bulbs are working, you are finished. Close the hood and you are ready to drive.

When to replace both headlights at the same time

If one headlight has burned out, the other is likely to fail soon after. Headlight bulbs have a typical lifespan of 500 to 1,000 hours of use. If one has reached the end of its life, the other is probably close behind. Many drivers choose to replace both bulbs at the same time to avoid a second trip under the hood in a few weeks.

Replacing both bulbs also ensures that your headlights have the same brightness and color temperature. Over time, bulbs dim slightly, so a new bulb paired with an older one will look noticeably brighter on one side. If appearance matters to you, buy two bulbs and install them both.

LED and HID bulbs: what you need to know

Standard halogen headlight bulbs are the cheapest option and work in any car designed for them. LED and HID (high-intensity discharge) bulbs are brighter and last longer, but they cost more — typically $40 to $100 per bulb. LED bulbs last 20,000 to 30,000 hours compared to 500 to 1,000 hours for halogen.

Before you buy an LED or HID bulb, check your owner's manual to confirm your car's headlight system is compatible. Some cars are designed for halogen bulbs only, and installing an LED or HID bulb can cause electrical problems or poor light output. If your manual does not mention LED or HID compatibility, stick with the bulb type your car came with.

LED and HID bulbs also generate less heat than halogen bulbs, which can be an advantage in cold climates where heat helps melt snow and ice off the lens. However, they may require a separate ballast or driver module to work correctly. Your bulb packaging will tell you whether additional parts are needed.

Frequently Asked Questions

Can I replace just one headlight or do I have to replace both?

You can replace just the burned-out bulb. However, the remaining original bulb will be older and dimmer, so your headlights will not match in brightness or color. Many drivers replace both at once to keep them even, but it is not required.

What if I cannot get the old bulb out?

If the bulb is stuck, try twisting it gently back and forth rather than pulling straight. If it still will not budge, spray a small amount of penetrating oil like WD-40 around the base of the socket, wait 10 minutes, and try again. If the socket itself is stuck in the housing, explore the same oil and gently work it back and forth. Do not force it hard enough to break the plastic.

Is it safe to drive with one headlight out?

Most states require both headlights to be working. Driving with one headlight out is illegal in most places and reduces your visibility at night. Replace the bulb as soon as you can, or have a mechanic do it if you are not comfortable doing it yourself.

How long do headlight bulbs last?

Standard halogen bulbs last 500 to 1,000 hours of use, which is typically one to three years depending on how often you drive at night. LED bulbs last 20,000 to 30,000 hours. HID bulbs fall in between at 2,000 to 3,000 hours. Extreme heat or cold can shorten these lifespans.

What is the difference between low-beam and high-beam headlights?

Low-beam headlights point downward and are used for normal driving. High-beam headlights point straight ahead and are used on dark roads when no other traffic is nearby. They use different bulbs and are controlled by separate switches. Your owner's manual will show which bulb type each one uses.