Seat Leon Fog Lights: Specs, Fitment & Common Faults
On the Leon, a genuine wiring fault can leave front fogs permanently on with headlights without the driver realising — plus a real sealed-unit water ingress fix worth knowing.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — aftermarket Hella 1NE 011 077-011 / Hella 1NE 011 077-021
| Fog light, passenger side (LH / nearside) — aftermarket | Hella 1NE 011 077-011 (H8, with bulb, no cornering); Hella 1ND 011 157-031 (H8, with bulb, cornering light); Hella 1ND 012 999-031 (LED); Van Wezel 4946997 (H8, without dynamic bending light); Van Wezel 4924995 (H8); Diederichs 7433089 (H8, with bulb, dynamic bending light) |
|---|---|
| Fog light, driver's side (RH / offside) — aftermarket | Hella 1NE 011 077-021 (H8, with bulb, no cornering); Hella 1ND 011 157-041 (H8, with bulb, cornering light); Hella 1ND 012 598-021 (H8, with bulb, cornering light); Hella 1ND 012 999-041 (LED); Van Wezel 4946998 (H8); Van Wezel 4924996 (H8) |
| Bulb types | H8 (PGJ19-1); LED units (Hella 1ND 012 999 pair) |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine units against your VIN |
| Fitment notes | Cornering and non-cornering versions are both listed; Alkar 2959099/2960099 are Sport only and Diederichs 7433289 is Cupra only; fog lamps are bumper-mounted. |
A Genuine, Real Case Worth Knowing About Fogs Stuck On — Seat Leon Fog Lights
A genuinely worth-knowing, real account: one owner was pulled over by police for having their front fog lights on continuously, completely unaware — it turned out the fogs were wired to activate automatically whenever the headlights were switched on, rather than only when the separate fog switch was pulled. This is worth checking directly if you're not entirely sure your fogs only come on when you specifically activate them, since driving with front fogs on unnecessarily is both an MOT/legal consideration and simply inconsiderate to oncoming traffic. If you notice this happening on your car, it's worth having the wiring checked, since correctly-functioning fogs should only illuminate via their own dedicated switch action, not automatically alongside the headlights.
Seat Leon Fog Lights: Rarely Used, Easy to Forget About Until Needed
The Seat Leon's fog lights sit idle for the vast majority of owners most of the year, which is exactly why a fault can go undetected for months — surfacing only on the one properly foggy morning when it matters most.
Seat Leon Fog Lights: Watch: Replacing It
LED fog bulb fitting on Mk3
Seat Leon 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 Leon 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
Seat Leon Fog Lights: Generations, Derivatives & Fog Light Type
| Standard trims, halogen headlight cars | Front fog lights are conventional halogen units, and genuinely double as static cornering lights on cars without HID/adaptive headlights — this cornering function is coding-enabled rather than always active from the factory |
|---|---|
| R-Line/higher trims, LED headlight cars | Genuine LED fog lights become available, with cornering function built into the main headlight unit instead of the fog light on cars with the full adaptive lighting package |
Not every trim level of the Leon 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 Seat Leon 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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Seat Leon 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 Seat Fog Lights
The same part, covered across other Seat models.