What is the low beam headlight bulb size for a 2018 Subaru WRX STI?

The 2018 Subaru WRX STI uses a H11 LED 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 Subaru WRX STI?

The high beam bulb size for the 2018 Subaru WRX STI is 9005 LED.

Why are my 2018 Subaru WRX STI headlights dim?

Dim headlights on a 2018 Subaru WRX STI can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H11 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2018 Subaru WRX STI fog light?

The 2018 Subaru WRX STI uses a H16 LED bulb for the fog light position.

Is the 2018 Subaru WRX STI single or dual beam?

The 2018 Subaru WRX STI 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 Subaru WRX STI?

Yes, the 2018 Subaru WRX STI comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H11 LED LED conversion kit for the low beams.

Does the 2018 Subaru WRX STI have fog lights?

Yes, the 2018 Subaru WRX STI takes a H16 LED bulb for the fog light position.

Did the 2018 Subaru WRX STI change headlight bulb sizes from the previous year?

Yes — the 2018 Subaru WRX STI uses different bulb sizes than the 2017 model. The 2018–2019 generation introduced this bulb configuration.

Is the 2018 Subaru WRX STI the first or last year to use H11 LED bulbs?

The 2018 Subaru WRX STI is the first year in the 2018–2019 generation to use the H11 LED bulb for the low beam headlight.

How do I change the headlight on a 2018 Subaru WRX STI?

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 H11 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.

Are LED headlights legal for a 2018 Subaru WRX STI?

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 H11 LED 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 Subaru WRX STI headlights?

A pair of halogen H11 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.

What is the difference between halogen and LED for a 2018 Subaru WRX STI?

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 H11 LED position are available as direct plug-and-play replacements.

The 2018 Subaru WRX STI is the first model year to use this bulb configuration (2018–2019).

Fitment Guaranteed for 2018 Subaru WRX STI

What Size Bulbs Does a 2018 Subaru WRX STI 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 Subaru WRX STI Have?

The 2018 Subaru WRX STI utilizes a refined lighting configuration featuring 14 distinct bulb positions. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate H11 LED low beam and 9005 LED high beam bulbs for precise light distribution.

Can You Put LED Bulbs in a 2018 Subaru WRX STI?

Upgrading to LED is one of the most effective ways to modernize your Subaru's appearance and safety profile. We recommend starting your upgrade with the H11 LED low beams, as they see the most use. Adding a matching 9005 LED LED kit later will complete the look and ensure consistent lighting performance. Don't forget the H16 LED fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2018 Subaru WRX STI Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	H11 LED	Buy H11 LED →
High Beam	9005 LED	Buy 9005 LED →
Fog Light	H16 LED	Buy H16 LED →
Brake Light	LED Bulb	Buy LED Bulb →
Side Marker	168 LED	Buy 168 LED →
Turn Signal Front	7440NA LED	Buy 7440NA LED →
Turn Signal Rear	7440NA LED	Buy 7440NA LED →
Reverse Light	921	Buy 921 →
Dome Light	DE3175	Buy DE3175 →
License Plate	168	Buy 168 →
Map Light	DE3175	Buy DE3175 →
Parking Light	168	Buy 168 →
Trunk Light	168	Buy 168 →
Daytime Running	9005	Buy 9005 →

How do the 2018 Subaru WRX STI's bulbs compare to other years?

The 2018 Subaru WRX STI 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 →

Finding the best installation guide...

Other WRX STI Years

2020 2019 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004

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