Parts for your 2015 Subaru Legacy-Exterior bulbs

2015 Subaru Legacy exterior bulbs: purpose, maintenance and replacement

Based on the Subaru Owner’s Manual for the 2015 Legacy and Subaru service literature for the BN/BS series (Lighting section), exterior bulbs are standard equipment on this model. They cover headlamps, indicators, stop/tail lamps, reverse lights, fog lamps, daytime running lights and number plate lights. Most trims run halogen bulbs, some higher-spec variants and certain markets use HID or LED units for select functions. Either way, exterior bulbs are a core safety system on the 2015 Legacy and are maintained as part of routine servicing.

The job of these bulbs is simple but vital: help the driver see and be seen. Headlamps and fogs punch light down the road in poor conditions, while tail, brake and indicator bulbs communicate intent to other road users. Number plate bulbs keep the plate legible, and DRLs improve daytime conspicuity. Subaru’s service guidance calls for regular lighting checks, many WoF/roadworthy inspections in NZ and Australia fail on something as basic as a dull brake light.

For servicing and replacement, owners should:

• Inspect all exterior lights at each service or every 10,000 km/6 months. Look for dim, discoloured or intermittent bulbs and any lens moisture.
• Replace halogen bulbs in pairs to keep colour and brightness matched. Avoid touching the glass, skin oils can shorten life.
• If fitted with HID or LED assemblies, note these may be high-voltage or sealed units. DIY is not recommended, use a qualified technician.
• Use quality, ADR-compliant bulbs for Australia/NZ. Up-rated “+” halogens can add brightness but may have shorter lifespans.
• After any bulb or housing change, confirm beam aim and pattern against a flat wall and road test at night.
• Clean lenses with plastic-safe cleaner. Oxidised headlight lenses can be restored to recover output.
• Check connectors and earths for corrosion, a dab of dielectric grease helps keep moisture at bay.

Bulb access varies by position. Commonly, headlamp bulbs are accessed from within the engine bay via twist caps, rear lamp bulbs are reached by removing the boot trim panel to get to the bulb holders. The correct bulb spec is listed on the lamp housing and in the owner’s manual, trim and market can change the exact type, so matching to VIN or checking the manual is the safest bet.

Popular questions about 2015 Subaru Legacy exterior bulbs

What exterior bulbs does a 2015 Legacy use?
It depends on trim and market. Many cars use halogen bulbs for headlamps and conventional filament bulbs for tail, stop, indicators and reverse. Some higher-spec models may have HID or LED for low beam or DRLs. Always check the bulb chart in the owner’s manual or on the back of the lamp housing to confirm the exact types for the vehicle’s VIN and market.

Can the headlight bulbs be upgraded to LED?
Physically, many halogen-fit globes can be swapped for LED retrofits, but legality and performance vary. The beam pattern can be worse than a quality halogen if the LED doesn’t suit the reflector/projector. Ensure any upgrade is ADR-compliant, won’t upset CAN-bus or DRL functions, and have the beam aim checked professionally. For HID/LED factory units, stick with OE-spec components.

How often should exterior bulbs be replaced?
There’s no strict interval, but halogen bulbs commonly lose brightness before they fail outright. Replacing in pairs every few years or at 40–60,000 km is sensible for consistent output. Otherwise, replace immediately at signs of dimming, colour shift, or failure, and include a quick light check at each service.