Parts for your 2018 Subaru Impreza-Exterior bulbs

2018 Subaru Impreza exterior bulbs — what they do and how to look after them

Exterior bulbs are absolutely used on the 2018 Subaru Impreza. Technical references including the 2018 Subaru Impreza Owner’s Manual (Lights/Replacing Bulbs), Subaru Service Manual lighting section, and the Subaru Genuine Parts Catalogue for the GK/GT series all note a mix of replaceable exterior bulbs (e.g., indicators, fogs on some trims, tail/stop, reverse, number plate) and sealed LED units on higher trims for headlamps or DRLs. That means exterior bulbs remain relevant for ongoing servicing and roadworthiness.

On this model, exterior bulbs handle the basics: seeing the road, being seen, and signalling clearly. That covers low/high beams, front and rear indicators, tail and stop lamps, reverse lights, fog lamps where fitted, and number plate illumination. Some trims use halogen projector headlights (commonly H11 low beam and HB3/9005 high beam), while up-spec variants run LED headlamps that are sealed assemblies. Regardless of trim, the Impreza still relies on conventional replaceable bulbs in several exterior positions.

As part of regular servicing, it’s smart to check exterior lighting every 10,000 km or six months, and before long trips or WOF/rego checks. Look for dull, flickering, or out bulbs, cracked lenses, and moisture. Replace failed bulbs promptly—indicators that flash rapidly usually point to a blown globe. Use the correct wattage and fitment listed in the owner’s manual or parts catalogue. On halogen lamps, avoid touching the glass with bare fingers, skin oils can shorten lifespan. Where the car has LED headlamps, DRLs or a high-mount stop lamp, those are typically non-serviceable and need dealer-level replacement if faulty.

• Replace bulbs in pairs (left/right) to keep brightness and colour consistent.
• Keep a small kit of common spares (e.g., indicator and number plate bulbs) in the boot.
• If a socket looks corroded, clean gently and consider a light dab of dielectric grease.
• After replacing, test all functions: low/high beam, indicators, hazards, brake, reverse, fogs, and number plate lights.
• If heavy condensation persists inside a lamp, have the housing and seals checked.

Many front bulbs are accessed behind the headlamp via the engine bay or inner guard, rear bulbs are typically through the boot trim. When in doubt, follow the owner’s manual procedure. Using ADR/ECE-compliant bulbs helps avoid glare and ensures the Impreza stays legal on Aussie and Kiwi roads.

Popular questions

What bulb types fit a 2018 Subaru Impreza headlights and indicators?
Bulb types vary by trim. Many 2018 Impreza models use halogen low beams (commonly H11) and halogen high beams (often HB3/9005), while higher trims have sealed LED headlamps. Front and rear indicators, tail/stop, reverse, fogs (if fitted), and number plate lights are typically replaceable bulb types.

Always confirm against the owner’s manual or the Subaru Genuine Parts Catalogue for the exact build, as some variants use different lamp technologies or sockets.

Can owners upgrade halogen bulbs to LED on a 2018 Impreza?
Retrofit LED bulbs in halogen headlamp housings can affect beam pattern and may not comply with ADR/WOF requirements. In Australia and New Zealand, on-road legality generally requires compliant optics and approved components. Many owners stick with quality halogen or OEM-equivalent upgrades, or swap entire compliant headlamp assemblies where allowed.

For interior or non-headlamp exterior positions, check that any LED replacement is CANbus-friendly and road-legal for that location.

How often should exterior bulbs be replaced?
There’s no set interval—replace on condition. Halogens dim over time, proactive owners often refresh key lamps every 2–3 years to keep brightness up. During each service, a quick walk-around test catches failures early.

LED assemblies generally last longer but are replaced as complete units if they fail.