Audi A3  Self-help  Fuses and bulbs  A3 Saloon: Changing bulbs for rear lights
Check that the seal is seated correctly on the bulb carrier.
Position the bulb carrier on the rear light and align it with the securing tabs.
Lightly press the bulb carrier into the rear light until it engages. Make sure that all the securing tabs click into place.
Re-install the rear light Link.

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