Volvo XC90 front fog light bulbs use H1 size while rear fog light bulbs use H21W size. The replacement chart covers 2003 to 2014 model years 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 Volvo XC90 front fog light uses the H1 bulb across all model years from 2003-2014.
The H1 is a single-filament halogen bulb operating at 12V and 55W, fitted with a P14.5s base, and manufactured to ECE standards with approval also extended to the US and Japanese markets.
The P14.5s base on the H1 is a single-pin design, meaning it is not interchangeable with multi-pin or bayonet-style halogen bases used in other fog light applications.
The Volvo XC90 rear fog light uses the H21W bulb across all model years from 2003-2014.
The H21W is a single-filament signalling bulb rated at 12V and 21W, fitted with a BAY9s bayonet base, and built to ECE standards.
The BAY9s base on the H21W features offset pins, a design that prevents accidental installation of electrically incompatible bulbs into the same socket.
The H1 and H21W serve distinct functions in the XC90, with the higher-wattage H1 handling forward illumination in fog conditions and the lower-wattage H21W serving as a rear warning signal.
Because both bulb types conform to ECE standards, replacement units sourced from European, US, or Japanese markets are electrically and physically compatible with the XC90 fog light housings across the full 2003-2014 production span.