2017 Subaru Forester Bulb Sizes

Quick Reference: 2017 Subaru Forester Bulb Sizes

The 2017 Subaru Forester offers a variety of lighting options that can sometimes lead to confusion when it comes to bulb replacements. Depending on your trim level and factory options, your Forester may have traditional halogen headlights, or more advanced HID (High-Intensity Discharge) projector headlights with integrated LED daytime running lights (DRLs). It's crucial to identify which lighting system your vehicle is equipped with before purchasing replacement bulbs to ensure you get the correct fit.

Most 2017 Forester models come with halogen bulbs for the low beams (H11) and high beams (H9). However, higher trim levels, such as the Touring, often feature HID projector low beams (D4S), which offer significantly brighter and crisper light output. These HID systems also typically include integrated LED DRLs, meaning there isn't a replaceable bulb for the DRL function in those specific headlight assemblies. Fog lights across all trims commonly use H11 halogen bulbs.

For signal lights and auxiliary lighting, the 2017 Forester primarily uses incandescent bulbs. The front and rear turn signals often employ 7440A (amber) or 7440NA (amber, no amber cap for clear lenses) bulbs, while the brake and tail lights usually utilize 7443 bulbs, which are dual-filament for both brake and tail light functions. Reverse lights are commonly 921 bulbs. Smaller bulbs like the license plate, front and rear side markers, and interior map lights typically use 168 or 194 bulbs. The dome light often takes a longer DE3175 style bulb.

LED vs Halogen Upgrade Considerations

Upgrading from halogen to LED bulbs can significantly enhance the look and performance of your 2017 Subaru Forester's lighting. LEDs offer brighter output, a whiter light color, and a much longer lifespan compared to traditional halogen bulbs. However, there are a few important considerations:

• CANBUS Errors: Many modern vehicles, including the 2017 Forester, utilize a CANBUS (Controller Area Network Bus) system to monitor vehicle components, including lighting. When you replace a halogen bulb with an LED, the lower power draw of the LED can trick the CANBUS system into thinking the bulb is out, triggering a