When a rear light cluster cracks or goes dark, the car immediately falls outside legal roadworthiness requirements — and modern assemblies are considerably more complex than the simple lens-and-bulb units of earlier decades. Contemporary tail light assemblies integrate the stop lamp, tail lamp, reversing lamp, fog lamp and often an indicator into a single moulded housing with a shared printed circuit board or bulb carrier. On some vehicles the LED modules are non-replaceable, meaning the entire assembly must be swapped. Physical damage from a minor parking collision is the most common reason for replacement, though internal circuit failures and condensation penetrating a cracked lens are also frequent causes. ABAKUS and Van Wezel are leading aftermarket suppliers covering a wide cross-section of European vehicles, both manufacturing assemblies with OE-equivalent loom connectors and lamp positions. Because housing geometry is unique to each model year and body variant — the assembly for a saloon boot lid is typically incompatible with its estate tailgate counterpart — matching the OE reference is the only reliable way to confirm you will receive the right unit for your specific car. Fog lamp positioning, number-plate lamp integration, and wiring harness routing can all vary between what look like identical model codes from the outside.
The OE number is the surest way to identify the correct unit. Assemblies vary by side (driver's versus passenger's), facelift date, body style (estate, saloon, hatchback) and trim level that determines whether LED or halogen lamps are fitted. Use your VIN or the make-model-year-trim selector on this page to narrow down to the specific OE reference. If your car has a facelift, the build date on the B-pillar sticker is often more reliable than the model year alone.
On older vehicles with separate lens panels and individual bulb holders, replacing a cracked lens alone is often possible and much cheaper. However, on modern integrated assemblies — particularly those with PCB-mounted bulb carriers or LED modules — separating the lens from the housing without specialist tooling typically damages both components. If your vehicle uses such an assembly and only the outer lens is cracked, sourcing a complete assembly is usually the safer and ultimately less expensive approach.
An OEM assembly is produced by the original lamp supplier — often MAGNETI MARELLI or a similar tier-one manufacturer — to the vehicle builder's exact specification, with the correct connector pinouts, lamp positions and housing material. Aftermarket assemblies from suppliers like ABAKUS or KLOKKERHOLM are engineered to equivalent dimensions and electrical compatibility. The main practical differences tend to be in lens tint depth and the quality of the internal reflector coating over time, rather than fitment.
Visible cracking of the lens is the most obvious sign, as even hairline fractures allow moisture ingress that corrodes the bulb contacts and eventually reaches the wiring loom. Other indicators include persistent condensation inside the housing that doesn't clear, a bulb failure warning on the dashboard that cannot be resolved by changing the bulb, or discolouration of the lens from heat caused by a failing bulb holder. Any of these signs should prompt inspection before the next journey at night.
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