Unless they go out completely, it can be hard to notice issues with your car's headlights. But it's important you catch problems before they go dark; otherwise, you could find yourself driving at night with next to no visibility. Here are some of the most common headlight problems and how to fix them.
One Bulb Goes Out
A single burned-out bulb is the most straightforward problem you'll run into. When one headlight dies, the other usually stays on, which is why drivers sometimes go days without noticing. If your dashboard throws a headlight warning or oncoming drivers keep flashing their brights at you, check both bulbs. Replacing a headlight bulb is a job most people can handle with a screwdriver and the right replacement bulb for their make and model.
Both Headlights Stop Working at Once
When both headlights go out together, the bulbs themselves are rarely the culprit. The more probable cause is a blown fuse or a failed relay. Your owner's manual will show you where the fuse box is and which fuse connects to the headlights. A blown fuse is cheap to replace, but if the new fuse keeps blowing, there's a wiring problem underneath that needs a professional look.
Fogginess or Yellowing on the Lens
Fogginess is one of the more frustrating issues with headlights. It can happen for a number of reasons, but one of the most common is UV exposure breaking down the outer coating on the plastic lens over time. Telling if your headlights are foggy or not is usually simple; the lens will look cloudy or yellowed instead of clear. A restoration kit with sandpaper and UV sealant can bring the lens back, though heavily damaged lenses may need full replacement.
Flickering Headlights
Flickering is your headlight's way of telling you something is loose or failing. In halogen bulbs, it often points to a dying bulb or a corroded socket. In HID or LED systems, flickering points more to a ballast issue or a voltage problem. Either way, don't ignore it. Flickering under highway speeds or in wet weather can drop your visibility fast when you need it most.
Headlights Aimed Too Low or Too High
Misaligned headlights don't burn out, so they're easy to overlook. But if your headlights point too far down, you lose road visibility. If they aim too high, you blind other drivers. Alignment drifts after accidents, rough road conditions, or suspension work. Most cars have adjustment screws behind the housing, and you can re-aim them yourself using a wall and some tape to mark the beam position. If you're not confident in the process, any shop can do it quickly.
When to Stop Waiting
Headlight problems don't tend to fix themselves. A flickering bulb becomes a dead bulb. A foggy lens gets worse with every season. Catching these issues early keeps you from dealing with a bigger problem later, and more to the point, it keeps you safer on the road at night. If something looks off, it probably is.
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