What does the Bulb / exterior light failure light mean?

A brake light, headlight or turn signal bulb has failed.

How much does it cost to fix the Bulb / exterior light failure light?

Typically $5 to $300 in the US, depending on the cause. A halogen bulb at the low end; a sealed LED assembly at the high end.

Urgency:Service soon

Yes, but a dead brake light or headlight is a ticket in every state and a real hazard at night. Fix it within days.

$5 – $300

A halogen bulb at the low end; a sealed LED assembly at the high end.

A typical range, not a quote. Actual cost depends on the car, the shop and the fault.

Walk around the car with the lights on and someone pressing the brake to find the dead one.