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Bulb Compatibility Chart
Headlamp type on the UK Citroën C4: LED front headlights and LED front fog lamps standard on all four UK trims. A halogen version exists in mainland Europe (H7 dipped / H7 main) but not in the UK. Rear fog P21W.
Headlamp unit: Sealed – ‘you must contact a CITROEN dealer or a qualified workshop’
Checked against Citroen C4 en-GB handbook (ServiceBox); Citroen UK prices & specifications Jan 2023. Fitment varies by trim and build date — confirm by registration or VIN before you buy.
| Position | Bulb | Notes |
|---|---|---|
| Dipped Beam | LED — not replaceable | The bulb you are most likely replacing |
| Main Beam | LED — not replaceable | Full beam |
| Front Fog | LED — not replaceable | Where fog lights are fitted |
| Front Indicator | LED — not replaceable | Amber front turn signal |
| Rear Indicator | WY16W | Amber rear turn signal |
| Reverse Light | W16W | Reversing lamp |
| Tail / Brake | Side lamps LED; brake lamps P21W (replaceable from inside the boot) | Rear side light and brake light |
| Number Plate | LED — not replaceable | Rear registration plate lamp |
Recommended Bulbs for Citroën C4
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What You Can Still Replace Yourself
The Citroën C4 has LED headlights, so there is no dipped-beam bulb to change. Several other exterior lamps are still conventional bulbs, and those you can replace yourself:
- Rear Indicator — WY16W.
- Reverse Light — W16W.
- Tail / Brake — Side. lamps LED; brake lamps P21W (replaceable from inside the boot
What to Do If a Light Fails
There is no user-serviceable bulb in the Citroën C4 headlamp. If the dipped or main beam fails, the headlamp module is the part that gets replaced — a dealer or auto-electrical job.
The lamps you can change yourself are rear indicator (WY16W), reverse light (W16W), tail / brake (Side). Those are ordinary bulbs and take ordinary tools.
MOT note: a failed headlight is an automatic MOT failure whether it is a bulb or an LED module, so it is worth diagnosing early rather than at the test.
LED Headlights and the MOT
The Citroën C4 came with LED headlights from the factory, so the usual “is an LED retrofit legal?” question does not apply — there is no halogen housing to retrofit into. The factory unit is type-approved as fitted.
What the MOT does check is that the lamps work, that beam pattern and aim are correct, and that lenses are not badly clouded. A partly failed LED array can still fail on beam pattern.
Frequently Asked Questions
What headlight bulb does a Citroën C4 use?
None. The Citroën C4 has LED headlights as standard across the UK range, so there is no replaceable headlight bulb. LED front headlights and LED front fog lamps standard on all four UK trims. A halogen version exists in mainland Europe (H7 dipped / H7 main) but not in the UK. Rear fog P21W.
Which bulbs can I still change on a Citroën C4?
Several exterior lamps are still conventional bulbs: rear indicator takes a WY16W; reverse light takes a W16W; tail / brake takes a Side. The headlight itself is a sealed LED unit.
Are LED headlight bulbs legal in the Citroën C4?
The question does not really apply here. These LED headlamps are factory-fitted and type-approved as they are. The retrofit-LED rule that catches people out applies to cars sold with halogen headlamps, which this is not.
Other Citroën C4 Guides
How we check fitment for this guide
We cross-reference fitment figures against manufacturer specifications and OE-supplier catalogue data where available, and matched to the standard codes that actually govern fit — battery type/group sizes, wiper lengths and fitting types, bulb fitment codes, tyre size markings, and oil specifications. We work by make, model, year, engine, and build date, because a single model can take different parts across its life. Where the right part depends on your exact vehicle, we tell you to confirm by registration or VIN. More on our method →