The Volvo V90 fog light requires a specific H3 bulb size for the front lighting assembly. Data for the bulb specifications covers the range from 1997 to 1998.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Volvo V90 front fog light position lists two bulb sizes for both 1997 and 1998, specifically the 881 and the H3. These two bulbs are not interchangeable despite serving the same position, as they follow different international standards and use physically distinct bases.
The 881 bulb follows the ANSI standard, which governs bulb specifications in the United States and Canada. It is a single-filament halogen bulb rated at 12V and 27W, and it uses a PGJ13 base.
The H3 bulb follows the ECE standard, which applies across Europe and other markets worldwide, though it also carries approval for use in the United States and Japan. It is a single-filament halogen bulb rated at 12V and 55W, and it uses a PK22s base.
The wattage difference between the 881 and H3 is substantial. The H3 operates at 55W compared to the 881 at 27W, meaning the two bulbs draw significantly different amounts of power and produce different light output levels.
The PGJ13 base of the 881 and the PK22s base of the H3 are mechanically incompatible. A socket designed for one will not accept the other, which makes the regional or market variant of the vehicle a determining factor in which bulb applies.
The Volvo V90 rear fog light position for 2018-2019 uses the H21W bulb. This is an ECE-standard single-filament signalling bulb rated at 12V and 21W, fitted with a BAY9s base.
The BAY9s base used by the H21W is a bayonet-type fitting with offset pins, a design that prevents incorrect installation of bulbs with similar but non-identical bases.
The H21W is classified as a signalling bulb rather than an illumination bulb. At 21W, it is intended for visibility functions such as rear fog lighting rather than for projecting light onto a road surface.
All three bulb types listed across the V90 fog light specifications operate on a 12V electrical system, which is standard for passenger vehicles of these model years.
Each of the three bulbs in the specifications uses a single filament. Single-filament bulbs serve one lighting function only and do not combine roles such as running light and brake light within a single unit.