The Volvo WX high beam and low beam headlight bulbs use a 9004 or H6024 bulb size. The replacement chart covers vehicle production years from 1996 to 1998 with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9004 is a dual-filament halogen bulb, meaning a single unit contains two filaments: one rated at 65W for high beam and one at 45W for low beam. This design allows it to serve both functions within one housing.
The 9004 uses a P29t base and operates at 12V. It conforms to the ANSI standard applicable in the United States and Canada.
The H6024 is a 7-inch round sealed beam unit that operates at 12V under the same ANSI standard. Unlike a conventional replaceable bulb, the entire sealed beam assembly is the light source and must be replaced as a whole when it fails.
On the Volvo WX, the 9004 handles both high beam and low beam functions simultaneously due to its dual-filament construction, which is why it appears under both sub-parts in the specifications.
The 1996-1997 model years present two distinct headlamp system types: halogen capsule headlamps using the 9004, and sealed beam headlamps using the H6024. These two bulb types are not interchangeable, as they belong to fundamentally different headlamp housing systems.
The 1998 model year lists only the 9004 for both high beam and low beam positions, with no headlamp system qualifier noted in the specifications.
The H6024 sealed beam unit and the 9004 halogen capsule bulb require different headlamp housings. Installing one type into a housing designed for the other is not supported by the specifications.