Ford Fiesta Fog Lights: Specs, Fitment & Common Faults
Whether the dashboard fog light icon illuminates when you press the button tells you exactly where to look first — a genuinely useful shortcut.
Illustration for editorial purposes
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OEM Part Number: 4550597 (as quoted in catalogue listings — confirm via VIN) — aftermarket Valeo 088358 / TYC 19-0139-01-2
| Fog light, passenger side (LH / nearside) — aftermarket | Valeo 088358 (H11, Fogstar, 90 mm round, bulb included, fits either side); Van Wezel 4327999 (H11, socket PGJ19-2, fits either side); Van Wezel 4327999V (H11, supplied with bulb and bulb holder, OES quality made by Valeo, fits either side); TYC 19-5785-11-2 (H11, ECE approved, fits either side); Diederichs 1419089 (H8, supplied with bulb, for cars with dynamic bending light); Van Wezel 1809997 (H8, socket PGJ19-1, paired with 1809998) / Van Wezel 1809997 (H8, socket PGJ19-1, paired with 1809998); Van Wezel 1947995 (H8, dynamic bending light, paired with 1947996); Diederichs 1419089 (H8, supplied with bulb, for dynamic bending light); TYC 19-6148-01-9 (H8, cornering light, Vignale and ST-Line); TYC 19-15280-01-9 (H8, cornering light); Abakus 431-2041L-UE (H8, no bulb) |
|---|---|
| Fog light, driver's side (RH / offside) — aftermarket | Diederichs 1404088 (H11, Depo/TYC); TYC 19-0139-01-2 (H11, no bulb holder); TYC 19-6147-01-9 (H8, cornering light, Vignale and ST-Line trims); Ford 4550597 (H11, bulb holder included, genuine Ford part, fits either side) / Van Wezel 1809998 (H8, socket PGJ19-1); Van Wezel 1947996 (H8, dynamic bending light); Diederichs 1419088 (H8, supplied with bulb, for dynamic bending light); TYC 19-6147-01-9 (H8, cornering light, Vignale and ST-Line); TYC 19-15279-01-9 (H8, cornering light); Abakus 431-2041R-UE (H8, no bulb) |
| Bulb types | H11 (PGJ19-2); H8 (PGJ19-1); H1 on older-model lamps; LED units (Diederichs LID10300, Einparts Duolight DL23) H8 (PGJ19-1); H11 on LED upgrade kits; LED kits (Einparts Duolight DL23, DL27, DL38, DL39) |
| Genuine (OE) numbers quoted | Ford 4550597 (front fog lamp, either side, marked as an original-equipment part) |
| Fitment notes | Most Mk7 lamps are H11 and fit either side; the H8 cornering or bending-light versions are for higher-spec trims, and cars without fog lights have blanking grilles in the lower bumper. All the lamps are left or right specific H8 units; the Vignale and ST-Line trims use cornering-light versions, and the standard-trim lamps are the plain H8 ones. |
A Genuine Diagnostic Shortcut: What the Dashboard Icon Tells You — Ford Fiesta Fog Lights
A genuinely useful diagnostic starting point on the Fiesta: pressing the fog light switch and watching whether the dashboard indicator icon illuminates tells you a lot about where the fault actually sits. If the icon lights up as expected but the physical lights themselves stay off, this points to a wiring, connector, or bulb problem downstream of the switch — the switch and its electronics are working correctly, so there's no point chasing a switch replacement. If the icon doesn't illuminate at all, the problem is more likely upstream, at the switch itself or the fuse feeding it.
On the Fiesta, two other genuinely common, specific causes worth checking: a wiring harness connector near the fog light that's come loose or was never reconnected properly after bumper or bodywork repair (a surprisingly common cause after any front-end repair work), and, less commonly but still worth ruling out, animal damage to the wiring loom on a car that's spent time parked outside — rodents chewing through wiring insulation is a genuine, if less obvious, cause of exactly this kind of intermittent or total fog light failure.
Ford Fiesta Fog Lights: Rarely Used, Easy to Forget About Until Needed
Most Ford Fiesta owners barely use their fog lights outside a handful of days a year, so a fault can sit unnoticed for a long stretch — until a properly foggy morning exposes it at exactly the wrong moment.
Ford Fiesta Fog Lights: Watch: Replacing It
Mk7 ST fog bulb change; same job on standard Mk7.
Ford Fiesta Fog Lights: 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 Fiesta 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 Fiesta 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 Ford Fiesta 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.
Ford Fiesta Fog Lights: Generations, Derivatives & Fog Light Type
| Standard trims | Halogen (H11) fog light bulb as standard |
|---|---|
| ST | Genuinely uses a completely separate cornering light bulb (PSX24W) alongside the H11 fog bulb — these are two different bulbs serving two different functions within the same housing, not a single dual-purpose unit |
| Later ST-Line/facelift examples | Factory LED fog light with cornering function is fitted as a sealed unit, confirmed as not user-serviceable for individual bulbs — replacing it means sourcing the whole assembly, not just a bulb |
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Ford Fiesta Fog Lights: Common Faults, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Fog Lights Guide for common faults to check for (including exactly what fails an MOT), how easy this job is to DIY, and aftermarket advice.
More Ford Fog Lights
The same part, covered across other Ford models.