Fiat 500X Headlights: Specs, Fitment & Common Faults

Bulb type, unit part numbers, and the faults that actually cause that flickering or dim light you've noticed.

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OEM Part Number: confirm via VIN — aftermarket LH Van Wezel 1704961M / RH TYC 20-15505-05-2

Accuracy note: Covers the Fiat 500X (2015-) as listed in the UK aftermarket catalogues. Headlights are sold by side (passenger / nearside = LH, driver's / offside = RH on a UK car) and by lamp type — halogen, xenon (D1S / D3S) and LED or full-LED units are not interchangeable, and DRL, cornering and levelling options change the part number again. The references below are UK aftermarket catalogue listings for this generation, labelled by brand; genuine numbers are shown only where a listing quotes one. Check the lamp type and traffic side (UK right-hand-traffic units, not LHD) against your VIN, and expect xenon / LED and adaptive units to need levelling adjustment or coding after fitting.

Passenger side (LH / nearside) headlight — aftermarket	Magneti Marelli 712484701129 (halogen H4, motor, bulbs included); Magneti Marelli 712455501129 (halogen H7 with WY21W, motor); Van Wezel 1704961M (halogen H4, for cars with electric levelling, no motor); Alkar 2741350 (halogen H4, electric levelling motor); Diederichs 3425881 (halogen H4, motor); Van Wezel 1604961 (halogen H7, electric levelling motor)
Driver's side (RH / offside) headlight — aftermarket	Magneti Marelli 712484601129 (halogen H4, motor, bulbs included); Magneti Marelli 712484801129 (bi-xenon D5S, bulbs included); Van Wezel 1704962M (halogen H4, for cars with electric levelling, no motor); Diederichs 3425880 (halogen H4, motor); TYC 20-15505-05-2 (halogen H7, electric levelling motor); Alkar 2702348 (halogen H1 with W21/5W and DRL, no levelling)
Bulb types	dipped and main beam H4 on the base lamps, H7 with WY21W on the later lamps, bi-xenon D5S; sockets P43t, PX26d
Genuine (OE) numbers quoted	None quoted in catalogue listings — order genuine units against your VIN
Fitment notes	Halogen H4, halogen H7, LED (Abakus 661-1180R-ND-E) and bi-xenon versions are listed, so check the trim before ordering; DRL is stated only on the Prasco P21W units and the Alkar H1 unit.

A Genuinely Important UK Rule Worth Knowing Before You Buy — Fiat 500X Headlights

If your 500X has factory-fitted halogen headlamp housings, converting them to fit LED bulbs is treated as a definite MOT failure under the current inspection manual — this isn't a grey area or a minor advisory, since a housing designed for halogen doesn't distribute an LED bulb's light output correctly, which can genuinely dazzle oncoming drivers. If you want a genuine LED upgrade, the correct route is a complete headlight unit designed for LED from the factory, not a bulb swap into an existing halogen housing.

Before you buy: matrix LED, adaptive, and cornering headlight systems often require electronic coding to the car after a unit swap, even for a genuine like-for-like replacement — a headlight that isn't recognised by the car's electronics can trigger warning lights or fail to auto-level correctly. Check whether your specific trim has one of these systems before assuming a straightforward bulb-in, bulb-out job.

Fiat 500X Headlights: Watch: Replacing It

🎬 Watch: 500X headlight bulb replacement (H4)

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H4 bulb

Fiat 500X Headlights: What It Does

On the Fiat 500X, main and dipped beam bulbs — or LED/matrix modules on higher-spec cars — live inside the headlight unit, angled carefully to illuminate the road without blinding oncoming traffic. The daytime running light and front indicator often share that same housing too, adding complexity to both fitment and repair.

Fiat 500X Headlights: Generations & Headlight Type

All generations	Halogen as standard, with LED daytime running lights and higher-spec bulb options on some trims and later model years

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Fiat 500X Headlights: Common Faults, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Headlights Guide for the four bulb technologies and how they differ, UK law on aim and modifications, common faults to check for, how difficult this job is to DIY, and confirming fitment against your VIN.

More Fiat Headlights

The same part, covered across other Fiat models.