Audi A4 Fog Lights: Specs, Fitment & Common Faults
On the A4, multiple lights failing together has genuinely been traced to a bad fuse box with several melted fuses inside — plus a confirmed Technical Service Bulletin for bi-xenon headlight flickering.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — aftermarket Valeo 043652 / Valeo 043653 and 088896
| Fog light, passenger side (LH / nearside) — aftermarket | B8: Valeo 043652 (H11, with bulb); Hella 1N0 271 648-111 (H11, with bulb); Hella 1NE 010 832-271 (H8, with bulb); Van Wezel 0327995 (H11); TYC 19-0648-01-9 (H11, S-Line version); Diederichs 1018089 (H11, with bulb). B9: Valeo 088895 (H11, with bulb) |
|---|---|
| Fog light, driver's side (RH / offside) — aftermarket | B8: Hella 1N0 271 648-121 (H11, with bulb); Diederichs 1018088 (H11, with bulb); TYC 19-0647-01-9 (H11, S-Line version); Diederichs 1019088 (H8, with bulb). B9: Valeo 043653 and 088896 (H11, with bulb); Hella 1N0 271 648-121 (H11, with bulb); TYC 19-0795-01-9 (H11) |
| Bulb types | B8: H11; H8; LED (Diederichs 1018388 set). B9: H11; H7 (PGJ19-2 socket on Abakus units) |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine units against your VIN |
| Fitment notes | B8 fog lamps exist in both H11 and H8 versions, so match the existing bulb. Valeo 043652 and 043653 are listed for the B8 and the B9. The Abakus and Alkar 2902479/2901479 units are for left-hand-drive cars only. No cornering-light versions are listed for either generation. |
Audi A4 Fog Lights: Rarely Used, Easy to Forget About Until Needed
The Audi A4'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.
Audi A4 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 A4 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.
Audi A4 Fog Lights: Watch: Replacing It
B8 bulb swap; for B9 try https://www.youtube.com/watch?v=24K56ZbuHyc (A5 Sportback F5 / A4 B9, title only, fog content unverified)
Fitment & Compatibility
Audi A4 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 A4 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 A4 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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A Genuinely Alarming, Real Finding Worth Knowing — Audi A4 Fog Lights
If multiple lights fail together, this is genuinely worth knowing: documented cases describe several lights going out around the same time being traced to a genuinely faulty fuse box, with individual fuses found melted inside it. It's also genuinely worth knowing a confirmed technical service bulletin exists covering certain models fitted with bi-xenon headlights, describing a xenon light sporadically flickering before going out, or failing permanently.
It's also genuinely worth knowing that a complete lack of power to the front fog lights has, in documented cases, simply been down to dirty contacts or a relay not fully seated in its socket, rather than a genuine component failure.
Audi A4 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.