Parts for your 2000 Subaru Legacy-Headlights

2000 Subaru Legacy headlights: what they do and how to look after them

Headlights are absolutely fitted to the 2000 Subaru Legacy. Technical references confirm it: the 2000 Subaru Legacy Owner’s Manual (Lighting section), the Subaru service manual for BE/BH chassis (Chassis Electrical), and the Subaru FAST parts catalogue all specify halogen headlamp units for this model. Market bulb types vary: many Australia/NZ cars use H4 dual‑filament halogen, while North American models commonly use HB5/9007 dual‑filament. Haynes’ Subaru Legacy/Outback workshop manual for 2000s models backs this up with identical bulb call‑outs and servicing steps.

On this Legacy, the headlights’ job is simple but vital: throw a clean, well‑aimed beam so the driver can see the road and be seen by others, especially at dusk, in rain, or on those dark rural runs. Low beam shapes the light to avoid dazzling oncoming traffic, while high beam punches further down the road when it’s safe to use. Properly working lamps also keep the car compliant for WOF/rego and ADR requirements.

When it’s time to replace a bulb, owners should check the exact type stamped on the headlamp housing or in the handbook, and always replace in pairs to keep the light colour and brightness matched. Under the bonnet, access is from the rear of the headlamp: pop off the rubber dust cap, unplug the connector, release the spring clip (H4) or twist the bulb holder (HB5/9007), then fit the new bulb without touching the glass. If the glass is touched accidentally, a wipe with isopropyl alcohol helps prevent hot spots and early failure.

There’s a bit more to headlight care than just bulbs. Ageing polycarbonate lenses can yellow or haze, scattering light. A decent restoration kit will usually bring them back. If there’s moisture inside the unit, check the rear cap seal and vents, persistent fogging can mean the housing needs replacing. After any work, confirm aim on level ground or have a workshop set it with a beam setter.

• Inspect beam, lens clarity, and operation every 10,000 km or 6 months.
• Clean lenses with a plastic‑safe cleaner, restore if yellowed.
• Avoid over‑wattage bulbs, stick to quality ADR‑compliant halogens (+30/+60) to protect wiring.
• If a bulb keeps blowing, check fuses, relays, earths, and charging voltage (about 13.8–14.5 V with engine running).
• Avoid retrofitting HID/LED into halogen reflectors unless the assembly is approved—glare can fail WOF and annoy everyone.

What bulb size does a 2000 Subaru Legacy use?

Most AU/NZ cars run H4 dual‑filament halogens. Many North American cars use HB5/9007. It’s best to confirm by checking the owner’s manual, the stamp on the headlamp housing, or the existing bulb base before buying replacements.

How can yellow or cloudy headlights be fixed on this model?

Use a headlight restoration kit that sands and polishes the lens, then seals it with a UV‑protective coating. If the inner reflector is dull or the housing leaks and keeps fogging, replacing the assembly is the longer‑term fix.

Why does one headlight keep blowing?

Common culprits are touching the bulb glass, poor earthing, vibration from a loose mounting, moisture in the housing, or high charging voltage. Check the earth points, ensure the rear cap seals properly, and verify alternator output is within spec.