Volvo V90 Cross Country Tail Light Bulb Size

The Volvo V90 Cross Country tail light requires a specific H21W bulb size for proper illumination and function. Data for the provided lighting specifications covers the period from 2017 through 2024.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2021-2024	H21W
2017-2019	H21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAY9s base. 12V, 21W.	H21W

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Additional Notes

The H21W is the sole tail light bulb type listed across all specified model years of the Volvo V90 Cross Country, covering 2017-2019 and 2021-2024.
The H21W operates on a 12-volt electrical system and draws 21 watts, which is standard for incandescent signalling applications in automotive tail light assemblies.
As a single-filament bulb, the H21W is dedicated to one lighting function rather than serving dual roles such as combined tail and brake duties.
The H21W uses a BAY9s base, which is an offset bayonet mount. The asymmetrical pin placement of the BAY9s base means the bulb can only be inserted in one orientation, preventing incorrect installation.
The H21W is governed by ECE regulations, a standard recognized across Europe and numerous other markets worldwide, distinguishing it from bulb types designed exclusively for North American SAE standards.
The BAY9s base is not interchangeable with more common bayonet bases such as the BA15s or BAY15d, so substitution with physically similar-looking bulbs risks an incompatible fit.