Fiat 500 Mk3 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 1648961 / RH Magneti Marelli 712507801129

Accuracy note: Covers the Fiat 500 Mk3 (500e 2020 on) 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 712507901129 (LED with LED indicator, original quality); Magneti Marelli 712507301129 (low beam, electric levelling, bulbs included, original quality); Van Wezel 1648961 (halogen H19 with W5W, electric levelling motor); Abakus 661-1186LMLDEM2 (halogen, position light, levelling motor, sold without bulb); Diederichs 3406085 (LED, levelling motor, Depo quality); Alkar 2741250 (halogen W5W, electric levelling motor)
Driver's side (RH / offside) headlight — aftermarket	Magneti Marelli 712507801129 (LED with LED indicator, original quality); Magneti Marelli 712507201129 (low beam, electric levelling, bulbs included, original quality); Abakus 661-1186RMLDEM2 (halogen, position light, levelling motor, sold without bulb); Diederichs 3406084 (LED, levelling motor, Depo quality); Alkar 2742250 (halogen W5W, electric levelling motor); Abakus 661-1180R-ND-E (LED, PX26d, sold without bulb)
Bulb types	H19 and W5W on the halogen units; LED units with LED indicator; sockets PU43t-3, PX26d
Genuine (OE) numbers quoted	None quoted in catalogue listings — order genuine units against your VIN
Fitment notes	check that the unit is listed for the 2020 car and that it matches the halogen or LED trim.

A Genuinely Important UK Rule Worth Knowing Before You Buy — Fiat 500 Mk3 Headlights

If your 500 Mk3 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 500 Mk3 Headlights: Watch: Replacing It

🎬 Watch: FIAT 500(e) HEADLIGHT REPLACEMENT

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Electric 500e

Fiat 500 Mk3 Headlights: What It Does

On the Fiat 500 Mk3, the main and dipped beams, whether conventional bulbs or LED/matrix modules on higher trims, sit inside the headlight unit at an angle calculated to illuminate the road without dazzling other drivers. Many modern units also combine the daytime running light and indicator into that same housing, adding a layer of complexity to both part numbers and repairs.

Fiat 500 Mk3 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 500 Mk3 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.