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Fitment Guaranteed for 1991 Subaru Loyale

What Size Bulbs Does a 1991 Subaru Loyale Use?

Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.

Installation Difficulty

Easy (Plug and Play)

Est. Replacement Cost

$15 - $40 (Halogen) / $30+ (LED)

What Lighting System Does the 1991 Subaru Loyale Have?

The 1991 Subaru Loyale features an extensive lighting system with 13 bulb positions. It uses halogen technology with a single 9004 LED dual-filament bulb handling both low and high beams. The Loyale has been available from 1990 to 1994, and the 1991 model falls in the early-generation years.

Can You Put LED Bulbs in a 1991 Subaru Loyale?

Upgrading the 1991 Subaru Loyale to LED headlights is straightforward since it uses a single 9004 LED dual-filament bulb for both low and high beams. You only need one pair of LED bulbs to upgrade both functions. Look for a 9004 LED LED kit that specifically supports dual-filament operation to ensure both beams work correctly. For the fog lights, a LED Fog Light LED bulb provides a clean white output that pairs well with LED headlights.

How to Replace Bulbs on a 1991 Subaru Loyale

To remove the headlight bulb, disconnect the wiring harness, then twist the bulb counter-clockwise and pull it straight out of the housing. Older model years like the 1991 Loyale typically offer easy access to the headlight bulbs from behind the headlight assembly under the hood. Most owners can complete the swap in under 10 minutes per side. When installing the new bulb, avoid touching the glass with bare fingers. Skin oils create hot spots that shorten bulb life. Wear clean gloves or handle the bulb by its plastic base only. The fog lights are accessed from underneath the front bumper. You may need to remove a few plastic clips or screws from the fender liner to reach the LED Fog Light fog light socket.

Full Upgrade Bundle

Upgrade All 13 Positions at Once

Low Beam: 9004 LEDHigh Beam: 9004 LEDFog Light: LED Fog LightBrake Light: 1156 LEDSide Marker: 194 LEDTurn Signal Front: 1156 LEDTurn Signal Rear: 1156 LEDReverse Light: 1156Dome Light: DE3175 or 158License Plate: 194 or 67Map Light: DE3175Parking Light: 67Trunk Light: 168
Shop Complete LED Kit

1991 Subaru Loyale Complete Bulb Size Chart

PositionBulb SizeShop
Low Beam
9004 LEDBuy 9004 LED
High Beam
9004 LEDBuy 9004 LED
Fog Light
LED Fog LightBuy LED Fog Light
Brake Light
1156 LEDBuy 1156 LED
Side Marker
194 LEDBuy 194 LED
Turn Signal Front
1156 LEDBuy 1156 LED
Turn Signal Rear
1156 LEDBuy 1156 LED
Reverse Light
1156Buy 1156
Dome Light
DE3175 or 158Buy DE3175 or 158
License Plate
194 or 67Buy 194 or 67
Map Light
DE3175Buy DE3175
Parking Light
67Buy 67
Trunk Light
168Buy 168

Want to upgrade everything at once?

Shop Complete LED Kit for 1991 Subaru Loyale
Installation Guide
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How Long Do 1991 Subaru Loyale Headlight Bulbs Last?

Standard halogen headlights on the 1991 Subaru Loyale have an expected lifespan of 500 to 1,000 hours, which works out to roughly 2 to 3 years of normal use. Signs of a failing halogen bulb include noticeably dimmer output, a yellowish tint compared to the other headlight, or intermittent flickering. At 35 years old, the original bulbs on your Loyale are likely overdue for replacement. Even if they still illuminate, reduced brightness significantly impacts nighttime safety. When one headlight burns out, replace both sides at the same time. Bulbs from the same batch age at similar rates, and mismatched brightness is distracting to oncoming drivers.

What Bulbs Are Compatible with the 1991 Subaru Loyale?

The 9004 low beam bulb on the 1991 Subaru Loyale is a specific fitment. There are no widely recognized cross-compatible alternatives, so make sure to purchase the exact 9004 size. Using the wrong bulb size can cause improper beam patterns that reduce your visibility and blind other drivers. It can also cause overheating inside the headlight housing, potentially warping the plastic lens or reflector. Always verify the bulb number before purchasing.

1991 Subaru Loyale Headlight FAQ

The 1991 Subaru Loyale uses a 9004 LED bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

The high beam bulb size for the 1991 Subaru Loyale is 9004 LED.

The 1991 Subaru Loyale uses a single bulb (dual filament) headlight system. This means one bulb controls both high and low beams.

Yes, the 1991 Subaru Loyale comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a 9004 LED LED conversion kit for the low beams.

Yes, the 1991 Subaru Loyale takes a LED Fog Light bulb for the fog light position.

Turn off the vehicle and open the hood. Locate the headlight assembly from behind, remove the dust cover or retaining clip, disconnect the wiring harness, twist the old 9004 LED bulb counter-clockwise to remove it, then insert the new bulb and reassemble. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

LED bulbs used off-road or in auxiliary lights are legal everywhere. For on-road headlight use, legality varies by state. Many states allow LED retrofits as long as the beam pattern meets DOT standards. For the best legal compliance, choose a DOT-approved 9004 LED LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

A pair of halogen 9004 LED bulbs costs $15 to $40, while LED conversion kits run $25 to $60 per pair. If you have a shop do the work, expect an additional $20 to $50 in labor per bulb. Replacing them yourself at home saves the labor cost and usually takes under 30 minutes.

Halogen bulbs produce a warm yellow light (around 3200K), last 500 to 1000 hours, and draw more power. LED bulbs emit a brighter white light (5000-6000K), last 25,000+ hours, and use less energy. LED upgrades for the 9004 LED position are available as direct plug-and-play replacements.

Did Subaru Loyale Bulb Sizes Change Over the Years?

The Subaru Loyale has maintained consistent bulb sizes across all model years from 1990 to 1994. The low beam has used a 9004 LED bulb throughout, which means replacement parts and LED upgrade kits are widely available and well-tested for this model. If you find a deal on bulbs for any Loyale year in this range, they will fit your 1991 model.

Other Loyale Years

1994199319921990
B9 TribecaBRZBajaBratCrosstekForesterImprezaJusty

Other Vehicles That Use 9004 LED Bulbs

These vehicles from other makes also use a 9004 LED low beam bulb:

2005 Chevrolet Venture2003 Isuzu Rodeo Sport2002 Dodge Ram 25002002 Dodge Ram 35002002 Isuzu Trooper2001 Nissan Xterra