2017 Audi A6 Headlight Bulb Size
GarageDex's headlight data confirms the 2017 Audi A6 uses D5S for both low and high beam, but as two separate bulbs rather than one shared one.
Key takeaways
- Low beam: D5S. High beam: D5S.
- Fitment varies by trim - check each position before buying.
- Fog, signal, and reverse bulbs use different sizes - check each before buying.
Where to buy bulbs for the 2017 Audi A6
Headlight bulbs dim over time, so replace them in pairs even if only one has failed. Most are a 10-minute DIY job. To order the exact sizes online:
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Can you replace it yourself?
What to buy
Both the low and high beams on this vehicle use D5S, but they are separate bulbs in separate housings - the part number is the same, the bulb is not shared. D5S is single-filament, so a car with both beams out needs four bulbs in total, or a pair for whichever beam has actually failed. Check which one is out before you buy. Replace them in pairs regardless. Bulbs from the same batch age at the same rate, so when one goes the other is usually close behind, and a fresh bulb beside a tired one is visibly brighter and unevenly aimed. Doing both at once costs a few dollars more and saves doing the job twice.
| Bulb | Covers | Type | Buy |
|---|---|---|---|
| D5S | low beam | Miniature | a pair |
| D5S | high beam | Miniature | a pair |
D5S is a widely used headlight bulb, fitted to 0.5% of the vehicles we hold specs for. Any parts store will have it, and you are not restricted to the dealer.
What a replacement should cost
A replacement D5S bulb runs about $5 to $25 for a standard halogen or $20 to $80 for an LED equivalent, per bulb. Always replace headlight bulbs in pairs: the surviving one is the same age and will fail soon after, and a fresh bulb next to a faded one throws visibly uneven light. If access means dropping the bumper or airbox, a shop will add roughly $20 to $60 per bulb in labour.
Ranges aggregated from published 2026 US repair-cost and parts price guides, including RepairPal and Car Talk. Prices vary by region, brand, and vehicle - treat these as a sanity check on a quote, not a fixed price.
Every bulb on this vehicle
Headlights get the attention, but the small bulbs are what fail an inspection. A burnt-out brake or turn bulb is also the cheapest ticket you will ever get, and most of these are a few dollars and a twist to change.
| Position | Bulb | Type |
|---|---|---|
| Low beam (headlight) | D5S | Miniature |
| High beam | D5S | Miniature |
Why this keeps getting harder
Headlight bulbs used to be a commodity: a handful of codes covered most cars and any of them cost a few dollars. That is ending. Across the vehicles we hold specs for, factory LED low beams went from 0% of 2000s cars to 59% of 2025-and-newer ones. LEDs last far longer, which is the upside and a real one. The tradeoff is that when they do fail, it is often not a bulb you can buy at all, and the fix moves from a $20 part to a headlight assembly.
- The full LED adoption study - how fast the fleet switched, measured across our own data.
- Halogen vs LED vs HID - what actually differs, beyond the marketing.
- How to change a headlight bulb - the ten-minute version.
- The most common headlight bulb types
Frequently asked
What headlight bulb does a 2017 Audi A6 take?
Both beams use D5S, but they are separate single-filament bulbs in separate housings rather than one shared bulb.
Is the 2017 Audi A6 headlight bulb a DIY job?
The 2017 Audi A6 uses D5S halogen low beams, which is the straightforward case: a real bulb, available anywhere, usually a ten-minute job. The one rule that matters is not touching the glass with bare fingers. Skin oil creates a hot spot that will kill the bulb early - handle it by the base, and if you do touch it, wipe it with rubbing alcohol before fitting.
Is D5S a common headlight bulb?
D5S is a widely used headlight bulb, fitted to 0.5% of the vehicles we hold specs for. Any parts store will have it, and you are not restricted to the dealer.
See where this ranks in our study of the most common headlight bulb types in the US.