Audi Q3 Cornering Bulb Size

The Audi Q3 cornering light utilizes bulb size H8 or 921 depending on the specific configuration of the lighting assembly. Data for the lighting components covers the period from 2016 through 2023.

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
2023	921
2016-2018	H8 (With HID Headlamps)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ECE standard (Europe & worldwide). Single-filament halogen bulb with PGJ19-1 base. Also approved in the US. 12V, 35W.	H8

Other Locations

Additional Notes

The Audi Q3 cornering bulb specifications reference two distinct standards: the ANSI standard, which governs the North American market, and the ECE standard, which applies to European and worldwide markets.
The 921 bulb is a T15 wedge-type unit rated at 12V and 16W, used in the 2023 Audi Q3 for the cornering function.
The H8 is a single-filament halogen bulb with a PGJ19-1 base, rated at 12V and 35W, and carries approval under both ECE and US regulations.
The H8 bulb applies to the 2016-2018 Audi Q3, but only in vehicles equipped with HID headlamps, making the headlamp type a required fitment condition.
The wattage difference between the two bulb types is notable: the H8 draws 35W compared to the 921's 16W, reflecting a significant difference in power consumption for the same cornering function.
The wedge base of the 921 and the PGJ19-1 base of the H8 are physically incompatible, meaning the two bulb types are not interchangeable regardless of voltage rating.