What is a Bulb Check & Replacement?
Faulty lights are a common MOT failure and a safety issue.
Simplified animation — not to scale.
In plain English
Your car has multiple sets of lights: headlights (main and dipped beam), side lights, brake lights, rear lights, indicators, reversing lights, fog lights, and number plate lights. Every one must work for your car to pass an MOT and for you to stay legal on the road. A blown bulb is cheap to replace and takes only a minute or two.
"Like checking all the torches in your house before a camping trip — one dead bulb could trip you up in the dark."
How it works
To check bulbs, switch on each light in turn and walk around the car — or ask someone to watch while you operate the pedals and switches. For brake lights, press the pedal; for indicators, switch each side on; for reverse, select reverse gear with the engine running (handbrake on). If a bulb is out, open the bonnet or access panel behind the light cluster. Most bulbs twist out of their holder or pop out of a clip. Note the bulb type (printed on the base or in your handbook), buy the correct replacement, and fit it without touching the glass with bare fingers — skin oils shorten bulb life. Test again before driving.
Signs of trouble
- ⚠One or more lights not working
- ⚠Warning light on the dash about a blown bulb
- ⚠Indicator flashing too fast on one side
- ⚠MOT advisory or failure for lighting
Always get a written quote. Prices vary by car, region, and parts brand.