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2018 Audi A5 Sportback Bulb Size Chart

Bulb sizes may vary by trim, factory lighting package, region, production date, and previous modifications. Verify the bulb number on your existing bulb before buying.

Last database update: May 2026. Manual review status: Not yet manually reviewed.

Verify before buying: check the bulb number printed on your existing bulb, confirm your trim and factory lighting package, and review the seller's fitment notes.
Disclosure: We may earn a commission from links marked Affiliate. Unmarked retailer links may be plain search links. Always verify bulb fitment before purchasing.

2018 Audi A5 Sportback Bulb Size Chart

PositionBulb CodeAliasesTrim / PackageFactory TypeConfidenceReviewNotesShop
Low BeamD5S—Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
High BeamD5S—Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
Turn Signal Front12181NA—Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon

2018 Audi A5 Sportback Fitment Notes

Our database shows the same listed bulb sizes for the Audi A5 Sportback across the 2018 to 2019 range. Still verify your trim, lighting package, and the bulb number in the housing before buying.

Known fitment limitations

  • factory HID or LED packages may use different parts
  • fog lights may depend on equipment package
  • aftermarket headlight assemblies may use different bulbs
  • regional models and production-date splits may differ

See an incorrect bulb size? Submit a correction.

How do the 2018 Audi A5 Sportback's bulbs compare to other years?

The 2019 model continues with the same bulb sizes.

This bulb configuration covers the 2018–2019 model years. 2019 →

Finding the best installation guide...

Other A5 Sportback Years

2019

More from Audi

100100 Quattro100 Series200200 Quattro4000 Quattro50005000 Quattro

Other Vehicles That Use D5S Bulbs

2019 Alfa Romeo 4C2019 Alfa Romeo Giulia2019 GMC Sierra 1500 Limited2019 GMC Sierra 25002019 GMC Terrain2018 Chevrolet Silverado

Frequently Asked Questions

Our database lists D5S for the 2018 Audi A5 Sportback low beam headlights. Verify the bulb number on your existing bulb and confirm your trim or factory lighting package before buying.

Our database lists D5S for the 2018 Audi A5 Sportback high beam position. Some vehicles vary by trim, lighting package, or previous housing changes.

Dim headlights on a 2018 Audi A5 Sportback can come from aging halogen bulbs, cloudy lenses, weak electrical connections, or an incorrect bulb. Confirm the listed D5S size against the bulb in the housing before choosing a replacement or upgrade.

The 2018 Audi A5 Sportback does not have a fog light bulb listed in our current database. If your vehicle has fog lights, verify the bulb in the housing or owner's manual before buying.

The 2018 Audi A5 Sportback uses a single bulb (dual filament) headlight system. This means one bulb controls both high and low beams.

LED upgrades are available for many D5S applications, but fitment, beam pattern, dashboard warnings, and road-use legality can vary. Use products that list your exact bulb family, such as D5S, and verify the factory housing before buying.

Access varies by engine bay layout and headlight housing. Before disassembly, confirm the listed D5S low beam size on the existing bulb or owner's manual, then follow the service procedure for your exact trim.

Rules for LED headlight retrofits vary by location and by housing type. Avoid products that create glare or lack road-use compliance claims, and check local requirements before using an LED conversion on public roads.

Replacement cost depends on bulb technology, brand, and labor access. Common halogen D5S replacements are usually cheaper than LED conversion kits. Check seller fitment notes before comparing prices.

Halogen bulbs and LED replacements differ in output, heat behavior, beam pattern, and electronics. A correct bulb code does not guarantee a correct LED beam pattern, so verify physical fit and seller compatibility notes for the 2018 Audi A5 Sportback.