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2017 Alfa-Romeo 4C 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.

2017 Alfa-Romeo 4C 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
Brake LightBRAKE—Standard listingHalogenHigh
Pending

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

Amazon
Dome Light6411—Standard listingHalogenMedium
Pending

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

Amazon
Turn Signal Front2827—Standard listingHalogenHigh
Pending

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

Amazon
Side Marker2821—Standard listingHalogenMedium
Pending

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

Amazon
License Plate2825—Standard listingHalogenMedium
Pending

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

Amazon
Turn Signal Rear7506—Standard listingHalogenHigh
Pending

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

Amazon
Reverse Light921—Standard listingHalogenMedium
Pending

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

Amazon
Trunk Light2825—Standard listingHalogenMedium
Pending

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

Amazon

2017 Alfa-Romeo 4C Fitment Notes

Across the 2014-2020 production range, our database shows changes in the listed Low Beam, License Plate, Trunk Light positions. Use the chart above for this 2017 model, then confirm the bulb number in your vehicle 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 2017 Alfa-Romeo 4C's bulbs compare to other years?

The 2017 Alfa-Romeo 4C uses the same bulbs as the 2016 model.

The 2018 model continues with the same bulb sizes.

This bulb configuration covers the 2015–2019 model years. ← 2016 2018 →

Finding the best installation guide...

Other 4C Years

202020192018201620152014

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Other Vehicles That Use D5S Bulbs

2019 Alfa Romeo 4C2019 Alfa Romeo Giulia2019 Audi A32019 Audi A42019 Audi A4 Allroad2019 Audi A4 Quattro

Frequently Asked Questions

Our database lists D5S for the 2017 Alfa Romeo 4C 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 2017 Alfa Romeo 4C high beam position. Some vehicles vary by trim, lighting package, or previous housing changes.

Dim headlights on a 2017 Alfa Romeo 4C 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 2017 Alfa Romeo 4C 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 2017 Alfa Romeo 4C 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.

No — the 2017 Alfa Romeo 4C uses the same bulb sizes as the 2016 model. This configuration has been consistent across the 2015–2019 generation.

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 2017 Alfa Romeo 4C.