If a headlight is not working, it reduces your visibility and makes it harder for other drivers to see you, especially at night or in poor weather. A failed headlight can be caused by a burnt-out bulb, wiring issues, fuse problems, or a faulty headlight switch. An inspection is needed to identify the cause and restore proper lighting.

What does it mean if a headlight is not working?

This usually means the bulb has failed, but it can also be caused by electrical issues such as blown fuses, bad relays, wiring faults, or a failing headlight switch. In some cases, moisture in the headlight housing may also cause failure.

Common causes of a headlight not working

• Burnt-out or failed bulb
• Blown fuse or faulty relay
• Damaged or corroded wiring or connectors
• Faulty headlight switch or control module
• Moisture inside the headlight housing

Why do you need to fix this problem quickly?

Driving with a headlight not working is unsafe and illegal. It reduces your ability to see at night and makes your vehicle less visible to others, increasing the risk of an accident. It may also result in a failed WOF or safety inspection.

How do you know when to get it checked?

You should book an inspection if:

• One or both headlights are not working
• The headlights flicker or work intermittently
• You notice dim or uneven lighting
• A dashboard warning light indicates a lighting fault
• You see moisture or damage inside the headlight assembly

What happens during an assessment?

A mechanic will:

1. Test the headlight bulbs to confirm failure
2. Check the fuses, relays, and wiring for faults
3. Inspect the headlight housing for damage or moisture
4. Test the headlight switch or control module
5. Replace faulty components as required
6. Confirm both headlights operate correctly after repair

How much does it cost to fix?

Replacing a headlight bulb typically costs $50–$120. If wiring, relays, or modules are faulty, repairs may range from $150–$500+. A full headlight assembly replacement may cost $400–$1,200+.

Is it unsafe to drive with a headlight not working?

Yes. A non-working headlight reduces visibility and makes your car less visible to others, especially at night or in bad weather. It should be repaired immediately for safety and compliance with the law.