The typical 2015 Subaru Impreza with halogen headlights uses H11 for the low beams, 9005 for the high beams, and H16 for the fog lights. Models equipped with HID or LED headlights use different replacement bulbs and assemblies.
In this article, we explain the standard bulb sizes by function and how to confirm the exact bulb type for your vehicle, including guidance for trims with optional HID/LED headlights and ways to verify before purchase.
Common bulb sizes by headlight function
Below are the typical bulb sizes used in 2015 Impreza halogen headlight assemblies by function. Keep in mind that trim level, regional specifications, or factory options can alter the exact fit, so verify before purchasing replacements.
- Low beam: H11
- High beam: 9005 (HB3)
- Fog light: H16
These sizes cover the majority of 2015 Impreza trims with halogen headlights. Always confirm by inspecting the bulb itself or consulting the owner's manual if you’re unsure.
Headlight technology variants
Some 2015 Impreza models came with upgraded headlights such as HID or LED options. In those cases, bulb replacements follow different standards and may involve ballast units rather than straightforward H-series bulbs. If you have HID or LED headlights, refer to your vehicle’s documentation or a Subaru dealer for the precise bulb type and replacement steps.
- HID headlights typically use ballast-based bulbs (commonly in the D-series family, e.g., D3S/D4S), not the standard H11/9005 sizes.
- LED headlights do not use traditional replaceable bulbs; they use LED modules that may require whole-unit replacement or specific OEM parts.
Because headlight technology can vary by trim and market, always verify the exact bulb type for your car before purchasing replacements.
How to confirm your bulb type
To ensure you get the correct bulb on the first try, use these verification steps before buying replacements:
- Check the owner’s manual or the headlight section of your vehicle’s documentation for bulb specifications.
- Inspect the bulb currently installed in the headlight: the printed size on the base is usually visible when the bulb is removed.
- Consult a Subaru parts catalog or dealership with your VIN or trim level for definitive part numbers.
Once you confirm the exact bulb type, you’ll avoid compatibility issues and ensure proper beam pattern and safety on the road.
Summary
For most 2015 Subaru Impreza models with halogen headlights, the standard bulb sizes are H11 for low beams, 9005 for high beams, and H16 for fog lights. If your model has HID or LED headlights, the replacement bulbs differ and may involve ballast or module replacements. Always verify using the owner's manual, the bulb markings, or a Subaru dealer to ensure you purchase the correct parts.