Audi A4 Tail Lights: Specs, Fitment & Common Faults
A genuinely honest finding: identical cars parked side by side showed completely different condensation patterns, more noticeable after driving in the rain — plus an account of a dealer replacing the whole cluster with no questions asked.
Illustration for editorial purposes
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Audi A4 Tail Lights: OEM Part Number
Audi A4 Tail Lights: More Wiring Behind There Than Most People Assume
The Audi A4's tail light unit combines several jobs in one housing — brake, indicator, reversing and rear fog light — so a single fault can knock out more than one function at once, and "the tail light's not working" isn't really one specific problem.
Audi A4 Tail Lights: What It Does
Beyond basic rear visibility, tail light units on the A4 typically integrate brake lights, indicators, reversing lights and rear fog lights into a single housing. Higher trims may use LED units with a distinct light signature, which are not interchangeable with standard halogen units even if the physical mounting looks similar.
Fitment & Compatibility
Audi A4 Tail Lights: Generations, Derivatives & Tail Light Type
| Standard trims | LED tail lights with dynamic turn signals and animation are standard on current generations, with halogen fitted to older models |
|---|---|
| Q5 only (within this generation family) | Genuine digital OLED tail lights are offered as an option exclusively on the Q5 — confirmed as NOT available on the closely related A4 or A5, despite sharing the same underlying platform |
Tail light design changed between generations of the A4, and facelifted versions within the same generation often use a revised light signature that isn't interchangeable with pre-facelift units. Always confirm the exact part for your specific model year before ordering. Whether you're sourcing a replacement tail 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 Honest, Real Finding Worth Knowing — Audi A4 Tail Lights
If a dealer suggests condensation in a tail light is simply normal, this is genuinely worth knowing: documented cases describe owners comparing otherwise identical cars parked side by side, finding some show condensation while others genuinely don't — worth knowing this isn't necessarily a universal design characteristic, and worth pushing for a proper repair rather than accepting a blanket "that's just how they are" explanation. It's also worth knowing this specific issue has been documented on more than one model in the range, more noticeably after driving for a while in the rain.
It's also genuinely worth knowing two distinct causes worth checking separately: the rubber seal between the cluster and the bulb holder should run centred and straight all the way around, and separately worth inspecting the cluster itself for hairline cracks. In at least one documented case, the actual cause turned out to be neither of these, but the light unit itself physically starting to separate at a seam over time.
Audi A4 Tail Lights: Common Faults, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Tail Lights Guide for diagnosing which circuit has failed, how easy this job is to DIY, and aftermarket advice.
More Audi Tail Lights
The same part, covered across other Audi models.