Fiat 500X Tail Lights: Specs, Fitment & Common Faults
A genuinely important, distinctive design fact: the tail light has no gasket at all by design — with a genuinely severe documented case where water ingress spread to soak footwells and eventually affect the car's electrics.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — tail light (aftermarket) Van Wezel 1618931 / Diederichs 3425891
| Tail lights (aftermarket) | Van Wezel 1618931 (left, without bulb holder, right-hand pair 1618932); Diederichs 3425891 (left, without bulb holder); Alkar 2201250 (left, without bulb holder, right-hand pair 2202250); Alkar 2201350 (left, LED, without bulb holder) |
|---|---|
| Genuine (OE) numbers quoted | None quoted in the catalogue listings — the genuine light varies by trim, bulb or LED type and facelift date, so order it against your VIN |
| Fitment notes | Left and right are separate parts; check LED or bulb type, whether the bulb holder is included, body style and facelift date before ordering. |
A Genuinely Important, Distinctive Design Fact Worth Knowing — Fiat 500X Tail Lights
This is genuinely important to understand on this specific model: the tail light assembly has been documented as having no gasket at all by design, with water from the rear of the car flowing straight down next to the bumper rather than being channelled away by a seal the way you might expect. This is worth knowing as a genuine design characteristic rather than assuming a missing or failed gasket is always the cause of water appearing in this area.
It's also worth knowing that light housings generally aren't fully sealed by design across most cars, including this one — they have small vents allowing air to expand and contract as the lamp heats and cools, which is what draws in outside air and can cause condensation to form when temperatures drop. Genuine condensation from this normal process typically appears after the lamp is rapidly cooled by rain or a car wash, or after a warm, humid day is followed by a cool, clear night, and should clear on its own as conditions change — worth distinguishing this from the more serious, documented no-gasket water ingress pattern described above.
Fiat 500X Tail Lights: More Wiring Behind There Than Most People Assume
The Fiat 500X's tail light unit combines several jobs in one housing — brake, indicator, reversing and rear fog light — so a single fault can knock out more than one function at once, and "the tail light's not working" isn't really one specific problem.
Fiat 500X Tail Lights: Watch: Replacing It
This video shows a closely related car on the same platform, so the light fittings and clips can differ slightly on yours.
Fiat 500X Tail Lights: What It Does
Beyond basic rear visibility, tail light units on the 500X typically integrate brake lights, indicators, reversing lights and rear fog lights into a single housing. Higher trims may use LED units with a distinct light signature, which are not interchangeable with standard halogen units even if the physical mounting looks similar.
Fitment & Compatibility
Fiat 500X Tail Lights: Generations & Tail Light Type
| Standard trims | Halogen bulb-based units as standard |
|---|---|
| Higher trims, later model years | LED tail lights become available further up the range, genuinely a different assembly and connector from the halogen units on lower trims |
Tail light design changed between generations of the 500X, and facelifted versions within the same generation often use a revised light signature that isn't interchangeable with pre-facelift units. Always confirm the exact part for your specific model year before ordering. Whether you're sourcing a replacement tail lights for your Fiat 500X from a dealer, specialist, or online marketplace, always check compatibility against your registration or VIN before buying, and confirm you're ordering the correct side — driver's side (RH in the UK) or passenger side (LH in the UK) — since these are not interchangeable.
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Fiat 500X Tail Lights: Common Faults, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Tail Lights Guide for diagnosing which circuit has failed, how easy this job is to DIY, and aftermarket advice.
More Fiat Tail Lights
The same part, covered across other Fiat models.