Audi A3 Fog Lights: Specs, Fitment & Common Faults
A genuinely alarming finding: multiple lights failing together was traced to a genuinely bad fuse box with several melted fuses inside — plus a confirmed Technical Service Bulletin for bi-xenon headlight flickering, and a clarification about shared fuses.
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Audi A3 Fog Lights: OEM Part Number
Audi A3 Fog Lights: Rarely Used, Easy to Forget About Until Needed
Most Audi A3 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.
Audi A3 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 A3 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 A3 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 Audi A3 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.
Audi A3 Fog Lights: Generations, Derivatives & Fog Light Type
| 8P/8V, halogen-headlight cars | Front fog lights are conventional halogen units, and genuinely double as static cornering lights on cars without HID/Xenon headlights — this cornering function is coding-enabled rather than always active from the factory |
|---|---|
| Cars with factory Xenon/HID headlights | The static cornering function is instead handled within the HID headlight unit itself rather than through the fog light — a genuinely different implementation from the halogen-headlight cars, confirmed by Audi's own coding documentation |
| S Line, factory option | Fog lamp moulding/trim with chrome accents is offered as a factory option, cosmetically distinct from the standard black surround but using the same underlying halogen fog light hardware |
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A Genuinely Alarming, Real Finding Worth Knowing — Audi A3 Fog Lights
If multiple lights fail together, such as a fog light indicator, headlight, and tail light all going out around the same time, this is genuinely worth knowing: one documented case traced exactly this pattern to a genuinely faulty fuse box, with several individual fuses found to be melted inside it. It's worth having the fuse box itself inspected if several seemingly unrelated lights fail together, rather than assuming several separate, coincidental faults. It's also genuinely worth knowing a confirmed technical service bulletin exists covering certain A3, A4, and TT models fitted with bi-xenon headlights, describing two related conditions: one xenon light sporadically flickering before going out, or one failing permanently — worth checking whether this bulletin applies to your specific car and headlight type if you're facing this exact symptom.
It's also genuinely worth knowing an honest, useful finding: a complete lack of power to the front fog lights has, in at least one documented case, simply been down to dirty contacts or a relay that wasn't fully seated in its socket, rather than any genuine component failure — worth cleaning the relevant contacts and reseating the relay firmly before assuming a more involved fault.
Audi A3 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 Audi Fog Lights
The same part, covered across other Audi models.