Ford Fiesta & Focus LED Interior Lights — Complete Bulb Guide
The Fiesta and Focus are two of the best-selling hatchbacks in Europe, and both leave the factory with dim, yellow interior lighting. A full LED swap is one of the most popular mods on these cars, and it is one of the easiest.
This guide covers the Fiesta (MK7, MK8) and Focus (MK2, MK3), including the exact bulb sizes and the fitment quirks that catch people out.
Ford Fiesta and Focus bulb sizes
| Position | Fiesta MK7/MK8 | Focus MK2/MK3 |
|---|---|---|
| Dome light | 42mm festoon | 42mm festoon |
| Map / reading lights | T10 (W5W) | T10 (W5W) |
| Footwell lights | T10 (W5W) | T10 (W5W) |
| Trunk / boot light | Festoon | T10 (W5W) |
| License plate lights | T10 (W5W) | T10 (W5W) |
The Fiesta trunk light varies by year. Some model years use a festoon, others a T10. Check before you order, or buy a kit that includes both.
Does the Fiesta or Focus throw error codes?
Mostly no. Ford does not aggressively monitor interior bulb resistance on the Fiesta or Focus, so standard LED bulbs usually work without flicker or warnings.
A few higher-spec Focus models with the interior light package do monitor some circuits, and if you get a flicker, error-free CANBUS bulbs fix it. For most owners, any correctly sized LED works fine.
Installation on the Fiesta and Focus
- Pop the lens covers off with a plastic trim tool. The Fiesta dome light cover is firm, so use steady pressure.
- Remove the old bulbs. Pull straight out, rocking gently if stuck.
- Insert the new LEDs. Plug and play.
- Test before closing. If a bulb doesn't light, flip it 180 degrees.
- Snap the covers back on.
The Focus footwell lights are especially worth doing first. The stock ones are barely visible, and a good T10 LED lights the whole footwell at night. They are also the easiest to access.
What color temperature looks best on a Ford?
6000K for a crisp modern white that matches the LED running lights on newer Fords. If you prefer a warmer factory look, 5000K is a solid choice.
Frequently asked questions
Are LED interior lights legal on a Fiesta? Yes. Interior lighting is not regulated like headlights or number plate lights.
Why does my trunk light flicker? Usually a loose bulb in a slightly oversized housing. Check the festoon length, it is the most common cause on Fiestas.
Can I change all the interior bulbs without tools? Mostly. A plastic trim tool helps, but a thin plastic card works for the lens covers.
The bottom line
The Fiesta and Focus are easy cars to upgrade to LED interior lighting. No serious CANBUS headaches, simple access, and a completely different cabin at night. Start with the footwells and the rest takes twenty minutes.
Browse custom-fit LED interior kits for Ford →
Related
Browse the full range of Ford LED interior light kits, or see all LED interior light kits.