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Subaru Legacy 2021 Bulb Size
Bulb size chart
Fog Light Bulb Front - LED
Headlight Bulb High Beam - 9005
Headlight Bulb High Beam and Low Beam - LED
Headlight Bulb Low Beam - H11
Back Up Reverse Light Bulb - 921
Brake Light Bulb - LED
Center High Mount Stop Light Bulb - LED
Daytime Running Light Bulb - LED
License Plate Light Bulb - 168, 917
Parking Light Bulb - LED
Side Marker Light Bulb Front - LED
Side Marker Light Bulb Rear - 168NA
Tail Light Bulb - LED
Turn Signal Light Bulb Front - 7444NA
Turn Signal Light Bulb Rear - 7440A
Dome Light Bulb - DE3175
Interior Door Light Bulb - 168, 917
Map Light Bulb - DE3175
Trunk or Cargo Area Light - 194, 7441
9005 Bulbs
Used for: Headlight Bulb High Beam
H11 Bulbs
Used for: Headlight Bulb Low Beam
921 Bulbs
Used for: Back Up Reverse Light Bulb
168 Bulbs
Used for: License Plate Light Bulb, Interior Door Light Bulb
917 Bulbs
Used for: License Plate Light Bulb, Interior Door Light Bulb
168NA Bulbs
Used for: Side Marker Light Bulb Rear
7444NA Bulbs
Used for: Turn Signal Light Bulb Front
7440A Bulbs
Used for: Turn Signal Light Bulb Rear
DE3175 Bulbs
Used for: Dome Light Bulb, Map Light Bulb
194 Bulbs
Used for: Trunk or Cargo Area Light
7441 Bulbs
Used for: Trunk or Cargo Area Light
The 2021 Subaru Legacy uses a mix of LED and halogen bulb setups depending on the light position and the vehicle’s trim or lighting package. This page is designed to help you verify the correct bulb size by lighting position, so you can quickly match the right replacement for headlights, fog lights, brake lights, interior lights, and other exterior lamps.
If you are replacing a burned-out bulb or planning a full lighting refresh, checking the bulb location first is the safest way to avoid ordering the wrong part. The 2021 Subaru Legacy can have different bulb types for different functions, and some positions may be LED on one version while another version uses a replaceable halogen bulb.
Fitment can vary by market, body style, trim, and factory lighting package, so always confirm what is actually installed on your car before buying replacements. The 2021 Legacy may use LED assemblies in several positions, while some versions still use serviceable halogen bulbs such as 9005 for high beam, H11 for low beam, 921 for reverse lights, and several smaller interior and exterior bulbs. If you are considering an aftermarket LED conversion, make sure the bulb base, beam pattern, and connector style are compatible, and remember that not every housing performs well with an LED retrofit. When possible, remove the old bulb and compare it before purchase, especially for positions like the front turn signal, rear turn signal, dome light, map light, and license plate light where multiple bulb numbers can appear in the same model year.
FAQ
What bulb sizes does the 2021 Subaru Legacy use for the headlights?
The 2021 Subaru Legacy may use LED headlight units on some trims, while other versions list a halogen low beam bulb of H11 and a high beam bulb of 9005. Because the setup can differ by trim and lighting package, check the exact headlight type on your vehicle before ordering.
Does the 2021 Legacy have LED fog lights?
Yes, the available bulb chart shows the front fog light bulb as LED. If your Legacy is equipped with fog lights, the assembly may be LED rather than a replaceable halogen bulb.
What is the brake light bulb size for the 2021 Subaru Legacy?
The brake light bulb is listed as LED. On LED-equipped rear lamps, the light source is usually part of the assembly rather than a standard removable bulb.
What bulb does the 2021 Legacy use for the reverse lights?
The back up reverse light bulb is listed as 921. This is one of the more common serviceable bulbs on the vehicle and is typically replaced from the rear lamp area.
What are the license plate light bulb sizes on a 2021 Subaru Legacy?
The license plate light bulb sizes are listed as 168 and 917. Either number may apply depending on the exact lamp design, so it is a good idea to confirm the installed bulb before buying.
What bulb fits the dome light and map light in the 2021 Legacy?
Both the dome light and map light are listed as DE3175. These interior bulbs are commonly used in compact overhead lamp housings.
What is the trunk or cargo area light bulb size?
The trunk or cargo area light uses bulb number 194 or 7441. If your cargo lamp is dim or out, check the socket style and the installed bulb number before replacement.
What are the front turn signal bulb sizes for the 2021 Subaru Legacy?
The front turn signal light bulb is listed as 7444NA. This bulb number is specific to the front indicator position on the Legacy.
What are the rear turn signal bulb sizes for the 2021 Legacy?
The rear turn signal light bulb is listed as 7440A. Rear signal bulb fitment can be different from the front, so do not assume both ends use the same part number.
What bulb is used for the rear side marker light?
The rear side marker light bulb is listed as 168NA. This is separate from the front side marker light, which is also LED on the available chart.
Are the parking lights and daytime running lights LED on the 2021 Subaru Legacy?
Yes, the available chart lists both the parking light bulb and the daytime running light bulb as LED. On many versions, these are integrated into the lighting assembly.
Can I upgrade my 2021 Legacy halogen bulbs to LED?
You can consider aftermarket LED conversions for positions that use serviceable bulbs, such as H11 low beam, 9005 high beam, 921 reverse, or the smaller interior bulbs. However, fitment, heat management, and beam pattern matter, and some housings work better with halogen than LED.
Why does the bulb size page mention trim and market differences?
Because the 2021 Subaru Legacy can vary by region, body style, and lighting package. Some cars use LED assemblies in places where others use replaceable bulbs, so the page is organized by lighting position to help you verify the correct fitment for your specific vehicle.