Skip to main content
Fitment Guaranteed for 2019 Alfa Romeo 4C

What Size Bulbs Does a 2019 Alfa Romeo 4C Use?

Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.

Installation Difficulty

Moderate (Dust covers often present)

Est. Replacement Cost

$15 - $40 (Halogen) / $30+ (LED)

What Lighting System Does the 2019 Alfa Romeo 4C Have?

The 2019 Alfa Romeo 4C features an extensive lighting system with 12 bulb positions. It uses halogen technology with a single HID-D5S LED dual-filament bulb handling both low and high beams. The 4C has been available from 2015 to 2019, and the 2019 model falls in the late-generation years.

Can You Put LED Bulbs in a 2019 Alfa Romeo 4C?

Upgrading the 2019 Alfa Romeo 4C to LED headlights is straightforward since it uses a single HID-D5S LED dual-filament bulb for both low and high beams. You only need one pair of LED bulbs to upgrade both functions. Look for a HID-D5S LED LED kit that specifically supports dual-filament operation to ensure both beams work correctly. For the fog lights, a LED Fog Light LED bulb provides a clean white output that pairs well with LED headlights.

How to Replace Bulbs on a 2019 Alfa Romeo 4C

To remove the headlight bulb, disconnect the wiring harness, then twist the bulb counter-clockwise and pull it straight out of the housing. On the 2019 4C, you will likely encounter rubber dust covers behind the headlight housing. These pull off by hand or unscrew depending on the design. Allow about 15 to 20 minutes per side. When installing the new bulb, avoid touching the glass with bare fingers. Skin oils create hot spots that shorten bulb life. Wear clean gloves or handle the bulb by its plastic base only. The fog lights are accessed from underneath the front bumper. You may need to remove a few plastic clips or screws from the fender liner to reach the LED Fog Light fog light socket.

Full Upgrade Bundle

Upgrade All 12 Positions at Once

Low Beam: HID-D5S LEDHigh Beam: HID-D5S LEDFog Light: LED Fog LightBrake Light: Brake Light AssemblyDome Light: 6411Turn Signal Front: 2827Side Marker: 2821License Plate: 2825Parking Light: LED BulbTurn Signal Rear: 7506Reverse Light: 921Trunk Light: 2825
Shop Complete LED Kit

2019 Alfa Romeo 4C Complete Bulb Size Chart

PositionBulb SizeShop
Low Beam
HID-D5S LEDBuy HID-D5S LED
High Beam
HID-D5S LEDBuy HID-D5S LED
Fog Light
LED Fog LightBuy LED Fog Light
Brake Light
Brake Light AssemblyBuy Brake Light Assembly
Dome Light
6411Buy 6411
Turn Signal Front
2827Buy 2827
Side Marker
2821Buy 2821
License Plate
2825Buy 2825
Parking Light
LED BulbBuy LED Bulb
Turn Signal Rear
7506Buy 7506
Reverse Light
921Buy 921
Trunk Light
2825Buy 2825

Want to upgrade everything at once?

Shop Complete LED Kit for 2019 Alfa Romeo 4C
Installation Guide
Open in YouTube →
Video suggestion: Installation GuideBy YouTube

How Long Do 2019 Alfa Romeo 4C Headlight Bulbs Last?

Standard halogen headlights on the 2019 Alfa Romeo 4C have an expected lifespan of 500 to 1,000 hours, which works out to roughly 2 to 3 years of normal use. Signs of a failing halogen bulb include noticeably dimmer output, a yellowish tint compared to the other headlight, or intermittent flickering. At 7 years old, the original bulbs on your 4C are likely overdue for replacement. Even if they still illuminate, reduced brightness significantly impacts nighttime safety. When one headlight burns out, replace both sides at the same time. Bulbs from the same batch age at similar rates, and mismatched brightness is distracting to oncoming drivers.

What Bulbs Are Compatible with the 2019 Alfa Romeo 4C?

The D5S low beam bulb on the 2019 Alfa Romeo 4C is a specific fitment. There are no widely recognized cross-compatible alternatives, so make sure to purchase the exact D5S size. Using the wrong bulb size can cause improper beam patterns that reduce your visibility and blind other drivers. It can also cause overheating inside the headlight housing, potentially warping the plastic lens or reflector. Always verify the bulb number before purchasing.

2019 Alfa Romeo 4C Headlight FAQ

The 2019 Alfa Romeo 4C uses a HID-D5S LED bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

The high beam bulb size for the 2019 Alfa Romeo 4C is HID-D5S LED.

The 2019 Alfa Romeo 4C uses a single bulb (dual filament) headlight system. This means one bulb controls both high and low beams.

Yes, the 2019 Alfa Romeo 4C comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a HID-D5S LED LED conversion kit for the low beams.

Yes, the 2019 Alfa Romeo 4C takes a LED Fog Light bulb for the fog light position.

Turn off the vehicle and open the hood. Locate the headlight assembly from behind, remove the dust cover or retaining clip, disconnect the wiring harness, twist the old HID-D5S LED bulb counter-clockwise to remove it, then insert the new bulb and reassemble. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

LED bulbs used off-road or in auxiliary lights are legal everywhere. For on-road headlight use, legality varies by state. Many states allow LED retrofits as long as the beam pattern meets DOT standards. For the best legal compliance, choose a DOT-approved HID-D5S LED LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

A pair of halogen HID-D5S LED bulbs costs $15 to $40, while LED conversion kits run $25 to $60 per pair. If you have a shop do the work, expect an additional $20 to $50 in labor per bulb. Replacing them yourself at home saves the labor cost and usually takes under 30 minutes.

Halogen bulbs produce a warm yellow light (around 3200K), last 500 to 1000 hours, and draw more power. LED bulbs emit a brighter white light (5000-6000K), last 25,000+ hours, and use less energy. LED upgrades for the HID-D5S LED position are available as direct plug-and-play replacements.

Did Alfa Romeo 4C Bulb Sizes Change Over the Years?

The Alfa Romeo 4C has maintained consistent bulb sizes across all model years from 2015 to 2019. The low beam has used a HID-D5S LED bulb throughout, which means replacement parts and LED upgrade kits are widely available and well-tested for this model. If you find a deal on bulbs for any 4C year in this range, they will fit your 2019 model.

Other 4C Years

2018201720162015
164GiuliaMilanoSpiderSpider GraduateSpider QuadrifoglioSpider Veloce

Other Vehicles That Use HID-D5S LED Bulbs

These vehicles from other makes also use a HID-D5S LED low beam bulb:

2019 Audi A32019 Audi A42019 Audi A4 Allroad2019 Audi A4 Quattro2019 Audi A5 Quattro2019 Audi A5 Sportback