2018 Subaru Crosstrek Bulb Sizes: A Comprehensive Guide

Quick Reference

Understanding Your 2018 Subaru Crosstrek's Lighting

The 2018 Subaru Crosstrek, a popular compact SUV known for its adventurous spirit, utilizes a mix of halogen and LED lighting based on the trim level. Understanding the specific bulb sizes and types is crucial for maintenance, repairs, and performance upgrades. This guide provides a comprehensive breakdown for all major lighting components.

Most Crosstrek models (Base and Premium trims) come equipped with traditional halogen bulbs for their headlights, fog lights, and turn signals, offering reliable illumination. However, the Limited trim introduces a significant upgrade with factory LED low beam headlights, providing a brighter, whiter light output and improved energy efficiency. It's important to note that even with LED low beams, the high beams typically remain halogen.

Headlights

• Low Beam: The Base and Premium trims use an H11 halogen bulb. The Limited trim features integrated LED low beams from the factory, meaning there isn't a replaceable bulb in the traditional sense for this function.
• High Beam: All trim levels of the 2018 Crosstrek use an H9 halogen bulb for the high beams.

Fog Lights

The fog lights on all 2018 Crosstrek models utilize an H16 halogen bulb, providing essential visibility in adverse weather conditions.

Daytime Running Lights (DRL)

The DRLs for the 2018 Crosstrek are integrated with the front turn signals and use a 7443 halogen bulb.

Turn Signals

• Front Turn Signal: A 7443 halogen bulb serves both the front turn signal and DRL functions.
• Rear Turn Signal: The rear turn signals use a 7440 halogen bulb.

Brake and Tail Lights

• Brake Light: The brake lights utilize a 7443 halogen bulb.
• Tail Light: Interestingly, the tail lights are LED from the factory on all trims, often integrated with the brake light housing, meaning no easily replaceable bulb for this function.

Reverse Lights

For backing up, your Crosstrek uses a 921 halogen bulb for the reverse lights.

License Plate Lights

The license plate is illuminated by a 168 halogen bulb.

Side Marker Lights

The side marker lights are integrated within the headlight assembly and typically use a 194 halogen bulb.

Interior Lighting

• Dome Light: The interior dome light uses a DE3175 halogen festoon bulb.
• Map Lights: The front map lights use 168 halogen bulbs.

LED vs Halogen Upgrade Considerations

Upgrading from halogen to LED bulbs can significantly enhance the look and performance of your 2018 Crosstrek's lighting. However, there are a few key considerations:

• CANBUS Errors: Modern vehicles, including the Crosstrek, use a CANBUS system to monitor electrical circuits. Installing LED bulbs, which draw less power than halogens, can sometimes trigger