Fiat 500 (Petrol) Fog Lights: Specs, Fitment & Common Faults

On the classic petrol 500, a rear fog light on a related model was genuinely configured as the wrong side in software until switched — oddly affecting window direction too.

Generation covered: this guide is for the classic petrol/hybrid 500 (2007–2024) — not the fully electric 500e (2020–present), which is a completely different car sharing no mechanical parts despite the similar styling. Check your logbook or VIN, or confirm whether your car has an engine or an electric motor, if you're unsure which one you have.

Illustration for editorial purposes

OEM Part Numbers

Accuracy note: we weren't able to verify a confident Fiat 500 (Petrol) fog lights part number at the time of writing. Please confirm the correct part via a Fiat dealer or parts specialist using your VIN.

A Genuinely Bizarre, Real Software Mismatch Worth Knowing About

This is genuinely worth knowing if a rear fog light won't work despite the bulb, wiring, and fuse all testing fine: one documented case on a related model found the rear fog light had been configured in the car's diagnostic software as "right hand," despite being physically fitted on the right side — switching this setting to "left hand" made the light work correctly. Oddly, this same setting was also found to affect which direction the power windows operated in reverse.

A genuinely useful, real diagnostic technique worth trying: directly firing the fog light relay using a simple 9V battery can help isolate where a fault genuinely lies — if the lights come on this way, the fault is between the relay and the bulb; if not, it lies before the relay.

It's also genuinely worth knowing about a real, documented fault worth ruling out: one case saw testing at the bulb holder reveal virtually no voltage, eventually traced to a fault with the Body Control Module itself rather than anything simpler.

Fiat 500 (Petrol) Fog Lights reference plate

Rarely Used, Easy to Forget About Until Needed

Fog lights sit unused for most owners most of the year, which means a fault can go unnoticed for a long time — right up until a genuinely foggy morning makes the problem obvious at the worst possible moment.

Before you buy: fog light fitment and bulb type vary by trim — not every trim level includes them as standard. Always confirm against your VIN before ordering.

What It Does

Front fog lights are angled and positioned to illuminate the road surface in low visibility conditions without creating the glare a standard headlight beam would in fog. Some higher trims of the 500 (Petrol) integrate fog lights into the same housing as cornering lights or daytime running lights, which affects both the part number and the complexity of any repair.

Fitment & Compatibility

Not every trim level of the 500 (Petrol) comes with fog lights fitted as standard, and the housing design often differs between trims that have them integrated with other lighting functions and those with a standalone unit. Always confirm your specific trim's fitment before ordering. Whether you're sourcing a replacement fog lights for your Fiat 500 (Petrol) 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.

Common Faults

What to Look For

One side not working — usually a blown bulb, the most common and easiest fault to fix.
Neither side working — more likely a blown fuse or a faulty switch than two bulbs failing simultaneously.
Condensation inside the lens — points to a failed seal, worth addressing before it affects the bulb or wiring.
Cracked housing from front-end impact — common given their low mounting position, usually a straightforward like-for-like replacement.

DIY Replacement Difficulty

Bulb replacement is usually an easy DIY job, though access varies — some versions require reaching up from underneath via the wheel arch liner, others come apart from the front. Full housing replacement is similarly straightforward on most versions. Expect 15–30 minutes for a bulb swap, longer if the housing itself needs replacing.

OEM vs. Aftermarket

Reputable aftermarket fog light units and bulbs are a reliable, cost-effective alternative to OEM parts for the vast majority of cases, since this is a relatively simple lighting component without the complexity of adaptive or LED headlight systems.

More Fiat Fog Lights Guides

The same part, covered across other Fiat models.