Audi A4 Headlights: Specs, Fitment & Common Faults

Bulb type, unit part numbers, and the faults that actually cause that flickering or dim light you've noticed.

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Audi A4 Headlights: OEM Part Number

Accuracy note: genuinely worth knowing: headlight type genuinely matters more than model name on the A4 — halogen, HID/Xenon, and LED (including adaptive/matrix LED on higher trims) use entirely different housings that aren't interchangeable, and swapping bulb type without swapping the housing isn't legal or safe. Confirm which your car has via the badge, owner's manual, or by looking at the unit itself before ordering.

A Genuinely Important UK Rule Worth Knowing Before You Buy — Audi A4 Headlights

If your A4 has factory-fitted halogen headlamp housings, converting them to fit LED bulbs is treated as a definite MOT failure under the current inspection manual — this isn't a grey area or a minor advisory, since a housing designed for halogen doesn't distribute an LED bulb's light output correctly, which can genuinely dazzle oncoming drivers. If you want a genuine LED upgrade, the correct route is a complete headlight unit designed for LED from the factory, not a bulb swap into an existing halogen housing.

Before you buy: matrix LED, adaptive, and cornering headlight systems often require electronic coding to the car after a unit swap, even for a genuine like-for-like replacement — a headlight that isn't recognised by the car's electronics can trigger warning lights or fail to auto-level correctly. Check whether your specific trim has one of these systems before assuming a straightforward bulb-in, bulb-out job.

Audi A4 Headlights: What It Does

The Audi A4's headlight unit houses the main and dipped beam bulbs (or LED/matrix modules on higher trims), positioned and angled to illuminate the road ahead without excessively dazzling oncoming traffic. Many modern units also integrate the daytime running light and front indicator into the same housing, which affects both the part number and the complexity of any repair.

Audi A4 Headlights: Generations, Derivatives & Headlight Type

B6/B7, factory options	H7/H7 halogen, single-Xenon (D1S/H7), or Bi-Xenon (D1S/H7) depending on trim — all three are genuinely different projector sizes and designs, not just bulb swaps
Current generation, all trims	LED headlights are standard across the board
Current generation, top trim	Matrix LED with fully automatic high beam is offered as the top-tier option, genuinely different from the standard LED fitted elsewhere in the range

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Audi A4 Headlights: Common Faults, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Headlights Guide for the four bulb technologies and how they differ, UK law on aim and modifications, common faults to check for, how difficult this job is to DIY, and confirming fitment against your VIN.

More Audi Headlights

The same part, covered across other Audi models.