Headlight replacement is usually a job you can do yourself, but the difficulty depends on your vehicle's make and model

Some headlights take five minutes to swap out. Others require removing the bumper, wheel well, or inner fender panel first. Before you buy a replacement bulb or assembly, check your owner's manual or search your vehicle's year, make, and model online to see what you're dealing with. A few minutes of research now saves you from buying the wrong part or discovering halfway through that you need a socket wrench set you don't own.

The cost of the bulb itself ranges from $15 to $30 for a standard halogen bulb, $40 to $100 for an HID (high-intensity discharge) bulb, and $50 to $200 for an LED bulb. If you're paying a mechanic to do the work, labor typically runs $50 to $200 depending on how much disassembly is required. A full headlight assembly (the entire housing, not just the bulb) costs $150 to $1,000 per side, depending on whether it's an OEM (original equipment manufacturer) part or an aftermarket replacement.

Key Takeaways

  • Check your owner's manual or look up your vehicle online before buying anything, because some headlights are accessible in minutes while others require removing panels or wheels.
  • Halogen bulbs cost $15 to $30, HID bulbs cost $40 to $100, and LED bulbs cost $50 to $200; full assemblies cost $150 to $1,000 per side.
  • If you're replacing just the bulb, you may only need to access the back of the headlight housing from inside the engine bay, which often requires no tools.
  • If your headlight is cracked, cloudy, or the housing is damaged, you'll need to replace the entire assembly, not just the bulb.
  • A mechanic's labor for bulb replacement typically costs $50 to $200; for assembly replacement, expect $100 to $400 in labor on top of the part cost.

Identifying whether you need a bulb replacement or a full assembly replacement

A bulb replacement means the headlight housing is intact but the bulb inside has burned out. You'll see no light on one or both sides, but the lens and housing look normal. This is the cheapest and fastest fix.

A full assembly replacement is necessary when the lens is cracked, the housing is damaged, the reflector inside is corroded or peeling, or the housing is cloudy and cleaning doesn't help. You may also need a new assembly if the bulb keeps burning out prematurely or if the headlight has water inside it. In these cases, replacing just the bulb won't solve the problem.

If you're unsure, turn on your headlights in a dark garage or at dusk and look at both sides. If one is noticeably dimmer, yellowed, or has visible cracks, you likely need an assembly. If both are equally dim or one is completely dark but the housing looks fine, it's probably just a bulb.

How to replace a headlight bulb yourself

Start by opening your hood and locating the back of the headlight housing. On most vehicles, you'll see a plastic or rubber connector with wires attached. Turn the connector counterclockwise (or pull it straight out, depending on the design) to remove it. The bulb should come out with it or be accessible once the connector is removed.

Before installing the new bulb, check whether it's a halogen, HID, or LED type. For halogen bulbs, avoid touching the glass with your bare fingers—oils from your skin can cause the bulb to overheat and fail. Use a clean cloth or the packaging to handle it. For HID and LED bulbs, follow the manufacturer's instructions, as some require specific positioning or have polarity (positive and negative sides).

Insert the new bulb into the housing, push the connector back on, and test the light. If it doesn't work, the bulb may be in backward or the connector may not be fully seated. If one side still doesn't work after you've replaced the bulb, the issue may be electrical (a blown fuse, a relay, or wiring), not the bulb itself.

Some vehicles have bulbs that are harder to reach. If you can't access the connector from the engine bay, check whether you need to remove the wheel well liner, bumper, or inner fender panel. Your owner's manual will show you how. If the job requires removing multiple panels, it's often worth paying a mechanic the $50 to $200 labor cost rather than spending two hours and risking damage.

Choosing the right bulb type for your vehicle

Your vehicle came with a specific bulb type, and you should replace it with the same type unless you have a reason to upgrade. Check your owner's manual or the bulb packaging to confirm the part number and type.

Halogen bulbs are the most common and least expensive. They produce a warm, yellowish light and last 400 to 1,000 hours. They're the standard on most vehicles made before 2010 and many made after.

HID (xenon) bulbs produce a brighter, whiter light and last 2,000 to 3,000 hours. They're more expensive and require a ballast (a small electrical box) to operate. If your vehicle came with HID headlights, you must replace them with HID bulbs; using a halogen bulb in an HID housing won't work. Upgrading from halogen to HID is possible but requires installing a ballast kit, which is a more involved job.

LED bulbs are the newest option, produce a bright white light, and last 25,000 to 50,000 hours. They're the most expensive but use less power and generate less heat. Some vehicles come with LED headlights; others can be retrofitted, though this may require additional wiring or modules. Check your manual or ask a mechanic whether your vehicle can accept LED bulbs before buying them.

When to replace the entire headlight assembly

If the lens is cracked, the housing is broken, or water is pooling inside, replacing just the bulb won't help. You'll need to remove the old assembly and install a new one.

Start by disconnecting the wiring harness at the back of the headlight. Then locate the bolts or clips holding the assembly in place—these are usually on the top, sides, or back of the housing. Remove them (you may need a socket wrench or screwdriver), and carefully pull the assembly out. Some assemblies are held in by the bumper or fender, so you may need to remove those first.

Before installing the new assembly, check that all the bolts and clips are included and that the assembly matches your vehicle's year and model. Align it with the mounting points, install the bolts or clips, and reconnect the wiring harness. Test the light. If it doesn't work, the connector may not be fully seated, or the bulb inside the new assembly may need to be installed separately (some assemblies come with the bulb already installed, others don't).

If the assembly is held in by the bumper or fender, you'll need to remove and reinstall those parts, which is a job most people should leave to a mechanic. The labor cost is worth it to avoid misaligning the bumper or damaging clips.

Headlight alignment after replacement

After replacing a headlight assembly, the new one may not be aimed correctly. Misaligned headlights can blind oncoming drivers or leave your road ahead poorly lit. Most states require headlights to be aimed within a certain range, and some states test this during vehicle inspections.

Many repair shops have a headlight aiming machine and can align both headlights in 15 to 30 minutes for $50 to $100. If you want to do a rough alignment yourself, park on a level surface 25 feet from a wall or garage door in a dark area. Turn on your headlights and mark where the beam hits the wall. The center of the beam should be slightly below the height of your headlights and slightly to the right of center (in the US). Adjust the screws or bolts on the back of the headlight housing until the beam is in the correct position. This is a temporary fix; a professional alignment is more accurate.

Common mistakes to avoid

Touching halogen bulbs with bare hands is the most common mistake. Skin oils cause hot spots on the bulb, which can cause it to overheat and burn out within hours. Use a clean cloth or the packaging to handle halogen bulbs.

Buying the wrong bulb type or part number is the second most common mistake. Before you buy, confirm your vehicle's year, make, model, and trim level. Some trims have different headlight types. If you're unsure, ask the parts store employee to look it up or check your owner's manual.

Forcing a bulb or connector into place can break the housing or connector. If something doesn't fit, stop and check that you have the right part and that you're inserting it in the correct direction. Connectors usually have a key or tab that only allows them to fit one way.

Skipping the alignment step after replacing an assembly can result in headlights that blind other drivers or leave your road poorly lit. Even if the light works, it may not be aimed correctly.

When to take your vehicle to a mechanic

If your vehicle requires removing the bumper, wheel well, or fender to access the headlight, a mechanic can do it faster and with less risk of damage. The labor cost ($100 to $400) is often worth it.

If the headlight doesn't work after you've replaced the bulb, the problem may be electrical—a blown fuse, a faulty relay, or damaged wiring. A mechanic can diagnose this with a multimeter and fix it. Trying to troubleshoot electrical issues without proper tools can waste time and money.

If you need headlight alignment after replacement, a shop with an aiming machine will do a better job than you can do manually. The cost is $50 to $100 and takes 15 to 30 minutes.

If your vehicle has HID or LED headlights and you're not comfortable working with electrical components, leave it to a mechanic. These systems have higher voltage and require more care than halogen systems.

Frequently Asked Questions

How do I know which headlight bulb my car needs?

Check your owner's manual or search your vehicle's year, make, and model online. The manual will list the bulb type and part number. You can also remove the old bulb and check the part number printed on it, then buy the same number. Most auto parts stores can also look it up if you give them your vehicle's information.

Can I replace just one headlight, or do I need 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. For assemblies, you only need to replace the damaged one unless both are cracked or cloudy.

Why does my new headlight bulb keep burning out?

You may be touching it with bare hands (halogen bulbs), the connector may not be fully seated, or there may be an electrical problem causing the bulb to overheat. If you've ruled out these issues, the headlight housing itself may be damaged or the vehicle's electrical system may be faulty. A mechanic can diagnose this with a multimeter.

Is it legal to upgrade from halogen to LED headlights?

It depends on your state and whether your vehicle was designed for LED headlights. Some states allow LED upgrades; others don't. Check your state's vehicle code or ask your local DMV. Even if it's legal, upgrading may require additional wiring or modules, and the headlights may not aim correctly without professional alignment.

How much does a mechanic charge to replace a headlight?

For a bulb replacement, expect $50 to $200 in labor depending on how accessible the bulb is. For a full assembly replacement, expect $100 to $400 in labor on top of the part cost ($150 to $1,000 per side). Call ahead and ask for a quote based on your vehicle's year, make, and model.