What is the low beam headlight bulb size for a 2018 Smart Fortwo?

The 2018 Smart Fortwo uses a H4 bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2018 Smart Fortwo?

The high beam bulb size for the 2018 Smart Fortwo is N/A.

Why are my 2018 Smart Fortwo headlights dim?

Dim headlights on a 2018 Smart Fortwo can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H4 LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2018 Smart Fortwo fog light?

The 2018 Smart Fortwo uses a H16 bulb for the fog light position.

Is the 2018 Smart Fortwo single or dual beam?

The 2018 Smart Fortwo uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2018 Smart Fortwo?

Yes, the 2018 Smart Fortwo comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H4 LED conversion kit for the low beams.

Does the 2018 Smart Fortwo have fog lights?

Yes, the 2018 Smart Fortwo takes a H16 bulb for the fog light position.

Did the 2018 Smart Fortwo change headlight bulb sizes from the previous year?

Yes — the 2018 Smart Fortwo uses different bulb sizes than the 2017 model. The 2018–2019 generation introduced this bulb configuration.

Is the 2018 Smart Fortwo the first or last year to use H4 bulbs?

The 2018 Smart Fortwo is the first year in the 2018–2019 generation to use the H4 bulb for the low beam headlight.

How do I change the headlight on a 2018 Smart Fortwo?

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 H4 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.

Are LED headlights legal for a 2018 Smart Fortwo?

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 H4 LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 2018 Smart Fortwo headlights?

A pair of halogen H4 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.

What is the difference between halogen and LED for a 2018 Smart Fortwo?

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 H4 position are available as direct plug-and-play replacements.

The 2018 Smart Fortwo is the first model year to use this bulb configuration (2018–2019).

Fitment Guaranteed for 2018 Smart Fortwo

What Size Bulbs Does a 2018 Smart Fortwo 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 2018 Smart Fortwo Have?

When it comes to nighttime visibility, the 2018 Smart Fortwo relies on an arrangement of 11 specialized bulbs. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate H4 low beam and high beam bulbs for precise light distribution. This model belongs to the late years of the Fortwo's 2005-2019 production span.

Can You Put LED Bulbs in a 2018 Smart Fortwo?

Upgrading to LED is one of the most effective ways to modernize your Smart's appearance and safety profile. We recommend starting your upgrade with the H4 low beams, as they see the most use. Adding a matching LED kit later will complete the look and ensure consistent lighting performance. Don't forget the H16 fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2018 Smart Fortwo Bulb Size Chart

Position	Bulb Size	Shop
Turn Signal Front	7507	Buy 7507 →
Low Beam	H4	Buy H4 →
Fog Light	H16	Buy H16 →
Reverse Light	921	Buy 921 →
License Plate	W5W	Buy W5W →
Brake Light	7528	Buy 7528 →
Side Marker	7528	Buy 7528 →
Turn Signal Rear	7507	Buy 7507 →
Tail Light	7528	Buy 7528 →
Dome Light	W5W	Buy W5W →
Map Light	W5W	Buy W5W →

How do the 2018 Smart Fortwo's bulbs compare to other years?

The 2018 Smart Fortwo changed bulb sizes from 2017. The previous model year used a different configuration.

The 2019 model continues with the same bulb sizes.

This bulb configuration covers the 2018–2019 model years. ← 2017 2019 →

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Other Fortwo Years

2019 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005

Other Vehicles That Use H4 Bulbs

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H4 Comparisons

9003 vs H4 H4 vs H7 H4 vs HB2