BMW 4 Series Tail Lights: Specs, Fitment & Common Faults
On the 4 Series, an official BMW bulletin genuinely explains taillights use waterproof membrane technology allowing natural condensation to escape — with example images distinguishing normal condensation from excessive water entry.
Illustration for editorial purposes
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BMW 4 Series Tail Lights: OEM Part Number
BMW 4 Series Tail Lights: More Wiring Behind There Than Most People Assume
The BMW 4 Series's tail light unit typically bundles several functions into one housing — brake light, indicator, reversing light and rear fog light — which means a single electrical fault can affect more than one function at once, and a "faulty tail light" can mean several genuinely different things.
BMW 4 Series Tail Lights: What It Does
Beyond basic rear visibility, tail light units on the 4 Series 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
BMW 4 Series Tail Lights: Generations, Derivatives & Tail Light Type
| Standard trims | Halogen bulb-based units as standard, in a conventional red lens design |
|---|---|
| M Sport/M Performance | Genuine factory "Black Line" tail lights — a smoked/blacked-out lens finish confirmed as a real BMW OEM part, not just an aftermarket style, giving a more aggressive rear appearance |
| Higher trims, later model years | Full LED tail lights with a distinct light signature become standard, genuinely not interchangeable with the halogen units on lower trims |
Tail light design changed between generations of the 4 Series, 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 BMW 4 Series 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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Confirmed: A Genuine Official Bulletin Worth Knowing About — BMW 4 Series Tail Lights
If condensation has appeared inside a tail light, this is genuinely worth knowing directly from an official BMW service bulletin covering this generation specifically: these tail lights use waterproof membrane technology, which deliberately allows naturally occurring condensation and air to escape without letting excess water or dirt enter. The official bulletin includes example images distinguishing normal condensation, appearing along the edges of the lens and requiring no correction, from excessive water entry, which appears across the entire lens rather than just at the edges.
It's also genuinely worth knowing that a confirmed UK recall covering related BMW models from an earlier era addressed a wiring fault where corrosion on a power distributor plug could cause the car to completely lose power, shutting down all lighting including hazard lights, brake lights, and headlights.
BMW 4 Series 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 BMW Tail Lights
The same part, covered across other BMW models.