Fiat 500 (Petrol) Grille: Fitment, Sensors & Common Damage

On the classic petrol 500, if radar-equipped, using a cheap generic OBD scanner genuinely risks removing a software override and causing a warning light every drive.

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

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OEM Part Number: confirm via VIN — radiator grille (aftermarket) Diederichs 3405140

Accuracy note: Covers the Fiat 500 (Petrol) (2007- petrol 500) as listed in the UK aftermarket catalogues. Grilles are sold by trim and facelift, and many generations had different grilles for base, mid and top trims, with or without a radar or camera opening. Where the catalogue splits a grille into left and right or upper and lower sections, buy both halves if both are damaged. The references below are UK aftermarket catalogue listings for this generation, labelled by brand with the fitment details the catalogue gives; carmakers rarely publish the genuine number against these, so match a genuine grille against your VIN if you want a guaranteed fit.

Radiator grille (aftermarket)	Diederichs 3405140 (chrome, chrome)
Genuine (OE) numbers quoted	None quoted in the catalogue listings — the genuine grille varies by trim level, facelift and sensor options, so order it against your VIN

A Genuinely Important Warning Worth Knowing Before Using a Cheap OBD Scanner — Fiat 500 (Petrol) Grille

If radar-based systems, such as adaptive cruise control, aren't functioning correctly, this is genuinely worth knowing before reaching for a cheap generic OBD scanner: one documented case on a related model saw a generic scanner's protocol remove a software override that had been keeping certain non-functional ADAS systems quiet, resulting in a warning message and check engine light every time the car was driven afterward.

A genuinely important diagnostic principle worth knowing if facing multiple, seemingly unrelated electrical faults together: this pattern often points toward a fundamental earth or negative battery connection issue affecting the whole electrical system, rather than each fault being genuinely separate — worth checking battery negative connections and earth straps as a starting point.

It's also genuinely worth knowing an honest, expensive real account: one documented case saw Fiat's own dealer replace fuel injectors and the entire common rail assembly trying to resolve an intermittent fault, only for the actual cause to turn out to be a single, genuinely cheap sensor sending incorrect information.

Fiat 500 (Petrol) Grille: Watch: Fitting It

🎬 Watch: Front Bumper Cover Removal and Replacement on FIAT 500 2008 - 2016

Watch on YouTube ↗

This video covers removing the front bumper, which is how the grille is reached on this car.

Fiat 500 (Petrol) Grille reference plate

Fiat 500 (Petrol) Grille: Cosmetic on the Surface, Functional Underneath

Treating the Fiat 500 (Petrol)'s grille as a purely cosmetic part is a common mistake — it also manages radiator airflow, and on many newer models incorporates or surrounds the sensors for adaptive cruise or parking assistance. That functional role is exactly why the correct part number matters more than it might seem.

Before you buy: grille design varies significantly by trim, and higher trims may integrate radar or camera sensors behind or within the grille itself. Always confirm against your VIN before ordering.

Fiat 500 (Petrol) Grille: What It Does

Beyond styling, the grille on the 500 (Petrol) directs airflow to the radiator and, on trims equipped with adaptive cruise control, may house or sit directly in front of the radar sensor used for that system. A grille that looks compatible but lacks the correct sensor cutout can interfere with these systems even if it fits physically.

Fiat 500 (Petrol) Grille: Generations, Derivatives & Grille Finish

Standard trims (Pop/Lounge)	Chrome or body-colour trim, not honeycomb
Sport Black trim	Black-trimmed grille and fog lamps as part of a wider blackout appearance package, paired with body-colour bumpers rather than a full black bumper
Abarth	Genuine honeycomb mesh grille integrated into the front bumper, a completely different design from standard trim, not just a colour change

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Fiat 500 (Petrol) Grille: Common Damage, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Grille Guide for common damage types, confirming trim-specific fitment, how difficult this job is to DIY, and the ADAS calibration risk with sensor-equipped grilles.

More Fiat Grille

The same part, covered across other Fiat models.