2017 Subaru Outback — Bulb Sizes (Headlight, Tail, Fog)

Quick reference

Notes on OEM variations: For North American 2017 Outback (2.5i, Premium, Limited, Touring, and 3.6R), low beams are halogen H7 projectors from the factory; Subaru did not offer OEM LED or HID low beams until the 2018 refresh with Steering Responsive LED headlights. DRL function is achieved by dimming the 9005 high beam—there is no separate DRL bulb. Most trims use H11 halogen fogs; if your vehicle has an OEM LED fog accessory, the assembly is a sealed module rather than a replaceable H11 bulb.

LED vs halogen upgrade considerations

• Headlights (H7 low beam): LED or HID retrofit kits can physically fit but require the correct H7 adapter/retaining ring style for the projector. Choose compact heat-sink designs to clear the dust cap. Expect a different beam pattern; aim the lamps after any change.
• High beam/DRL (9005): Because the 9005 also runs as a reduced-voltage DRL, many LED 9005s will flicker or shut off in DRL mode. Look for DRL/PWM-compatible 9005 LEDs or plan to add a DRL harness/decoder. If you only want LED high beams, retain halogen for DRL operation.
• Turn signals (7444NA/7440): Switching to LED can cause hyperflash. Use resistor-equipped LED bulbs or add 6–8 Ω, 50 W load resistors per side on the turn circuits. Ensure heat from resistors is managed away from plastic trim.
• Interior (194, 31mm): Polarity-sensitive—flip the bulb if it doesn’t light. Choose CANBUS-friendly LEDs to avoid faint glow when doors are closed.
• CANBUS/bulb-out warnings: The Outback’s monitoring is modest; turn signals are most sensitive (hyperflash). Brake/tail may show a warning if current draw is far below stock—use higher-quality LEDs with built-in resistors if needed.

How to replace each bulb

• Low beam H7: Turn the wheel outward for access, open the hood, remove the rear dust cap on the projector, release the spring clip, note the tab orientation, swap the H7, and reinstall the cap. Do not touch glass; wear gloves.
• High beam/DRL 9005: From the rear of the headlamp, twist the 9005 socket counterclockwise and pull straight out. Seat the new bulb firmly and twist to lock.
• Fog light H11: Turn the front wheel and pull back the fender liner access panel. Reach behind the fog housing, twist out the H11, swap, and lock. Verify aim afterwards.
• Front turn 7444NA and front side marker 194: Access at the back of the headlamp; each socket twists out separately. Use amber bulbs for the turn position.
• Tail/parking & brake 7443, rear turn 7440 (outer lamp): Open the cargo area, remove the two lamp screws, and gently pull the outer lamp straight back to release the clips. Twist out each socket and replace bulbs (7443 for tail/stop, 7440 amber for turn).
• Reverse 921 (liftgate inner lamp): Open the liftgate and pop off the small service cover behind the inner lamp. Twist the socket, replace the 921, and refit the cover.
• Rear side marker 194: With the outer lamp removed, access the small wedge-bulb socket at the lamp’s outer edge.
• License plate 194: From outside, use a plastic trim tool to pop the lens down, twist out the 194, replace, and snap the lens back.
• Map (194) & dome (31mm): For the map lights, pry the clear lens in the overhead console and pull the 194 wedge straight out. For the rear dome, carefully spread the spring clips and swap the 31mm festoon. Test before reinstalling lenses.

Common lighting issues for this generation

• DRL/LED incompatibility: LED 9005 bulbs may flicker in DRL mode due to PWM or low voltage. Use DRL-rated LEDs or retain halogen for DRL.
• Hyperflash after LED turn upgrades: Correct with load resistors or resistor-integrated bulbs; secure resistors to metal for heat dissipation.
• Moisture/condensation in headlamps or fogs: Check dust caps and housing seals. Light fogging can be normal; persistent moisture suggests a compromised seal.
• Melted or discolored 7443 sockets: Extended use of over-wattage bulbs or poor-contact LEDs can overheat sockets. Use OE-spec halogens or quality LEDs with proper heat management.
• Dim/poor cutoff with aged halogens: Projector lenses and bulbs dim over time. Replace bulbs in pairs and verify aim after any service.
• LED headlight retrofits not fitting the cap: Choose compact H7 LEDs or low-profile heat sinks; some require drilling the dust cap—avoid if possible to keep moisture out.

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