You can adjust most headlights yourself with basic tools in under an hour
Headlight aim — the vertical and horizontal angle of your beam — drifts over time from bumps, vibration, and normal wear. When your lights point too high, you blind oncoming drivers. When they point too low, you lose visibility on the road ahead. Most vehicles have adjustment screws or bolts on the back of each headlight housing that let you correct the aim without removing the light or visiting a shop.
The adjustment itself is straightforward: you park on level ground, mark a wall or garage door with tape, turn on your low beams, and turn two screws — one for vertical aim, one for horizontal — until the beam lands where it should. The whole job takes 30 to 60 minutes and costs nothing beyond a screwdriver or socket wrench you likely already own.
Key Takeaways
- Headlight aim drifts from road bumps and vibration, and you can correct it by turning adjustment screws on the back of each headlight housing.
- You need a level surface, a wall or garage door 25 feet away, tape, and a screwdriver or wrench that fits your vehicle's adjustment bolts.
- The beam should hit the wall with its brightest spot slightly below the center line and slightly to the right of the vehicle centerline.
- If your headlights have no visible adjustment screws, they may be sealed units that require a shop visit or headlight replacement.
Gather the right tools and find a level workspace
Start by checking your owner's manual or the back of the headlight housing itself — most vehicles label the adjustment screws or bolts so you know which one controls vertical aim and which controls horizontal. You will need a screwdriver (usually Phillips or flathead) or a socket wrench in the size that fits your vehicle's adjustment hardware. Some cars use 10mm or 8mm bolts; others use screws. Have a flashlight or work light ready so you can see the adjustment points clearly.
Park on level ground — a flat driveway or parking lot, not a slope — with at least 25 feet of clear space in front of you. A wall, garage door, or large flat surface works best. If you do not have a wall, you can tape a large piece of cardboard or plywood to a tree or post. The surface needs to be perpendicular to the ground and roughly at the same height as your headlights (usually 2 to 3 feet off the ground).
Mark the target area on your wall or surface
Measure the distance from the center of your left headlight to the center of your right headlight. Write this measurement down — you will use it to mark your target wall. Then measure the height of your headlights from the ground and write that down too.
On your wall or surface, use tape to mark a vertical centerline at the same height as your headlights. Mark a horizontal centerline down the middle of where your two headlights would project. You now have a cross on the wall that represents the center point between your two lights. This is your reference for aiming.
Turn on your low beams and observe where they hit
Turn off all other lights and close your garage door or wait for dusk so you can see the beam pattern clearly. Turn on your low beams. You will see two bright spots on the wall — one from each headlight. The brightest part of each beam (called the hot spot) is what you are aiming.
The correct aim for low beams is: the hot spot of each beam should sit slightly below the horizontal centerline you marked, and slightly to the right of the vertical line for that headlight. This angle prevents you from blinding oncoming traffic while keeping the road ahead well lit. Most manuals specify that the hot spot should be 2 to 4 inches below the centerline at 25 feet — check your owner's manual for your vehicle's exact specification.
Adjust the vertical screw first, then the horizontal screw
Locate the adjustment screws or bolts on the back of the headlight housing. The vertical adjustment screw usually sits on top or on the side of the housing; the horizontal adjustment screw usually sits to the side. Turn the vertical screw clockwise to raise the beam or counterclockwise to lower it. Make small quarter-turn adjustments and step back to check the wall after each turn.
Once the vertical aim is correct, adjust the horizontal screw. Turn it to move the beam left or right until the hot spot sits slightly to the right of the vertical centerline for that headlight. Again, make small adjustments and check your progress on the wall. Repeat this process for the second headlight, using the same reference points on your wall.
Check your work in real driving conditions
After both headlights are aimed, drive on a dark road at normal speed and observe how the beam lights the pavement and road edges. The light should illuminate the road ahead without creating a harsh cutoff line that blinds oncoming drivers. If oncoming traffic flashes their lights at you, your beams are still too high — go back and lower them slightly.
If you find that you cannot see the road well enough even after aiming, your headlights may be cloudy or oxidized, which reduces their brightness. In that case, headlight restoration or replacement may be necessary alongside aiming adjustment.
When to take your vehicle to a shop instead
Some vehicles have sealed headlight units with no external adjustment screws. If you cannot find adjustment hardware on the back of your headlight housing, your vehicle likely requires a shop visit. Sealed units sometimes have adjustment points inside the housing that require partial disassembly, or they may need to be replaced entirely if the aim has drifted.
If your headlights are severely misaligned — for example, one beam points straight up and the other points down — this can indicate frame damage or suspension problems beyond a straightforward aim adjustment. A shop can diagnose whether the issue is adjustment-only or structural.
Frequently Asked Questions
How often should I check my headlight aim?
Check your aim once a year or after any collision, pothole impact, or suspension work. Most vehicles drift slightly over time, but a full re-aim is usually needed only every 12 to 24 months under normal driving.
Can I adjust my high beams the same way?
Yes, the process is identical. High beams should point straight ahead at the centerline of your wall, with no downward angle. Adjust them after you finish your low beams, using the same screws or separate adjustment hardware depending on your vehicle design.
What if one headlight is much brighter than the other?
Brightness difference usually means one headlight is older or cloudy, not an aim problem. Aim both lights correctly first. If one still looks dim after aiming, that bulb or lens may need replacement.
Do I need to remove my headlight to adjust it?
No. The adjustment screws are accessible from behind the headlight housing without removal. If you cannot reach them, your vehicle manual will show you how to access them — sometimes by removing a wheel well liner or bumper trim.
Will adjusting my headlights affect my warranty?
Adjusting aim does not void your warranty. You are turning factory-provided screws to their intended purpose. If you damage the headlight housing itself during adjustment, that damage would not be covered, but the adjustment itself is a standard maintenance task.