If your fog or driving lights are not working, it reduces visibility in poor weather and makes it harder for other drivers to see you. The issue could be as simple as a blown bulb or fuse, or it may involve wiring faults, a faulty switch, or a damaged light assembly. An assessment will identify the cause and restore proper lighting.

What does it mean if fog or driving lights are not working?

This usually indicates an electrical or bulb issue in the lighting system. It could be a single light affected, or both, depending on whether the fault lies with the bulb, fuse, wiring, or control switch.

Common causes of fog or driving lights not working

• Blown light bulbs
• Blown fuse or faulty relay
• Faulty fog light or driving light switch
• Corroded or damaged wiring/connectors
• Water damage inside the light housing
• Failed light assembly

Why do you need to fix this problem quickly?

Working fog and driving lights are important for safe driving in fog, rain, and other low-visibility conditions. Faulty lights reduce visibility and may cause your vehicle to fail a WOF or safety inspection.

How do you know when to get it checked?

You should book an inspection if:

• Your fog or driving lights do not turn on
• Only one light works while the other does not
• The lights flicker or are dimmer than normal
• The fog/driving light warning light is on in the dashboard
• You notice condensation or water inside the lens

What happens during an assessment?

A mechanic will:

1. Check the bulbs, fuses, and relays for faults
2. Inspect the fog or driving light switch
3. Test wiring and connectors for corrosion or breaks
4. Inspect the light housing for water or damage
5. Replace faulty components or recommend full light assembly replacement if needed

How much does it cost to fix?

Replacing a fog or driving light bulb usually costs $80–$150. Fuse or relay replacement is similar. If the entire light assembly needs replacing, costs may range from $200–$500+ per unit.

Is it unsafe to drive with fog or driving lights not working?

Yes. While not needed in clear conditions, fog and driving lights are essential for safety in poor weather and low visibility. Faulty lights should be inspected and repaired promptly.