Replacing headlights yourself takes 15 to 45 minutes and costs $15 to $100 per bulb, depending on your vehicle and bulb type

Most headlight replacements are straightforward enough that you can do them in your driveway with basic tools. The process differs slightly by vehicle — some require removing a plastic trim piece or reaching through the wheel well, while others give you direct access from under the hood. The hardest part is usually figuring out which bulb type your car uses and whether you need to remove anything to reach it.

This guide walks you through the steps to replace a headlight bulb yourself, what tools you'll need, and when to call a mechanic instead. It also covers the different bulb types so you buy the right one the first time.

Key Takeaways

  • Check your owner's manual or the bulb itself to find the correct replacement type — common types are H7, H11, 9005, and 9006, and using the wrong one means it won't fit or won't work.
  • Most vehicles let you access the headlight from behind the headlight assembly under the hood, but some require removing a wheel or plastic trim piece first.
  • The bulb socket twists counterclockwise to remove and clockwise to install; never touch the glass part of an HID or LED bulb with bare hands, as skin oils can damage it.
  • If your headlight assembly is cracked, cloudy, or leaking water inside, the entire assembly needs replacement — a bulb swap won't fix it.
  • Luxury vehicles with HID or LED headlights often require a mechanic because the ballast or control module must be reset after installation.

Find your headlight bulb type before you buy

Your owner's manual lists the exact bulb type in the maintenance or specifications section. If you don't have the manual, look inside the headlight assembly itself — the bulb or socket is usually labeled with a code like H7, H11, 9005, or 9006. You can also search your vehicle's year, make, and model on an auto parts retailer's website, and they'll show you the correct bulb.

Halogen bulbs are the most common and cheapest ($15 to $30). HID (high-intensity discharge) and LED bulbs are brighter and last longer but cost $50 to $100 and often require professional installation because they need a ballast or control module. If you're unsure which type your car has, the manual will say, or you can ask at an auto parts store — bring your vehicle's year, make, and model.

Gather your tools and materials

You need the replacement bulb, a pair of work gloves or clean cloth, and possibly a screwdriver or socket wrench. Check your manual or search online for your specific vehicle to see whether you need to remove trim pieces or a wheel. Most cars need nothing more than the bulb itself.

Work in daylight or with a flashlight so you can see inside the headlight assembly. Wear gloves or use a clean cloth when handling the new bulb — skin oils on halogen bulbs can cause them to overheat and burn out early. HID and LED bulbs are even more sensitive to oils, so handle them carefully or ask the parts store to install them.

Access the headlight assembly from under the hood

Open your hood and locate the back of the headlight that's burned out. You'll see a plastic or rubber housing with wires connected to it. On most vehicles, you can reach the bulb socket from this angle without removing anything. On some cars — particularly older models or those with tight engine bays — you may need to remove a plastic trim piece, unscrew a fastener, or reach through the wheel well.

If you can't reach the socket easily, consult your owner's manual or search your vehicle's year, make, and model plus "headlight replacement" on YouTube. A video of someone doing the same car will show you exactly what to remove. Don't force anything — if it doesn't come loose easily, you're probably approaching it wrong.

Remove the old bulb and install the new one

Grasp the bulb socket (the plastic or rubber part the bulb sits in) and twist it counterclockwise about a quarter turn. It should come free in your hand. Pull the bulb straight out of the socket — it may take a little pressure, but it should not require force.

Insert the new bulb straight into the socket until it seats fully, then twist the socket clockwise until it stops. You'll feel a slight click or resistance when it's locked in place. Don't overtighten — a quarter turn past snug is enough. Reconnect any trim pieces you removed, close the hood, and test the headlight by turning on your headlights.

Test the new headlight and check alignment

Turn on your headlights and confirm the new bulb is working. If it's not, turn off the headlights, wait 30 seconds, and try again — sometimes the connection needs a moment to seat. If it still doesn't work, remove the bulb and check that it's fully inserted into the socket, then reinstall it.

If the bulb works but the light seems dimmer than the other side or points in a different direction, the headlight assembly may be misaligned. Most vehicles have adjustment screws on the back of the headlight assembly. Consult your manual for the location and direction to turn them. If you're uncomfortable adjusting them, a mechanic can do it in 15 minutes for $20 to $50.

When to take your car to a mechanic instead

If the headlight assembly is cracked, cloudy, or has water or condensation inside, the bulb isn't the problem — the entire assembly is damaged and needs replacement. This typically costs $200 to $600 per side depending on your vehicle. A mechanic can order the correct assembly and install it.

If your vehicle has HID or LED headlights, a mechanic should handle the replacement because the ballast or control module often needs to be reset or reprogrammed after installation. Attempting this yourself can result in error codes or the headlight not working at all. Most dealerships or independent shops charge $100 to $300 for HID or LED bulb replacement, which includes the reset.

If you can't access the bulb socket without removing major components like the bumper or fender, or if you're uncomfortable working under the hood, a mechanic can do the job in 30 minutes for $50 to $150 in labor, plus the cost of the bulb.

Frequently Asked Questions

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

You can replace just the burned-out one. However, if both bulbs are the same age, the other one may burn out soon. Some people replace both at the same time to avoid a second trip under the hood, but it's not required.

Why does my new headlight bulb keep burning out?

Skin oils on a halogen bulb cause premature burnout, so always wear gloves or use a cloth when handling it. Electrical problems like a faulty alternator or corroded battery terminal can also cause bulbs to fail early. If the new bulb burns out within a few weeks, have a mechanic check your charging system.

What's the difference between H7 and H11 bulbs?

They are different sizes and have different connector shapes — H7 bulbs won't fit in an H11 socket and vice versa. Using the wrong type means it won't install or won't work. Always check your manual or the old bulb to confirm which type you need.

Do I need to turn off the engine before replacing a headlight?

Yes. Turn off the engine and let it cool for a few minutes before working on the headlight. The engine bay can be hot enough to burn your hands, and you want to avoid accidentally touching moving parts.

Can I drive with one headlight out?

Most states allow driving during the day with one headlight out, but it's illegal to drive at night with only one headlight. You should replace the bulb as soon as possible. Many auto parts stores can install a bulb in 10 minutes while you wait.