Subaru Loyale high beam and low beam headlight bulbs both use a 9004 size. The replacement chart covers vehicle production years spanning 1990 to 1994.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9004 bulb is the sole headlight bulb type listed for the Subaru Loyale across both high beam and low beam positions for the 1990-1994 model years.
The 9004 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments, one rated at 65 watts for high beam output and one rated at 45 watts for low beam output.
Because the 9004 serves both the high beam and low beam functions in the Subaru Loyale, each headlight housing requires only one bulb to operate both lighting modes.
The 9004 operates on a 12-volt electrical system, which is standard for passenger vehicles of this type.
The 9004 uses a P29t base, a proprietary connector specific to this bulb family. This base type is not interchangeable with other common halogen bases such as H4, despite the H4 also being a dual-filament halogen bulb.
The 9004 conforms to ANSI standards and is approved for use in the United States and Canada, reflecting compliance with North American automotive lighting regulations.
The wattage difference between the two filaments, 65 watts on high beam versus 45 watts on low beam, produces a measurable difference in light intensity between the two modes.