Kia Forte Cornering Bulb Size

The Kia Forte cornering light requires bulb size 1157 or 921 depending on the specific configuration of the lighting assembly. Data for the bulb sizes covers the range from 2021 to 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	1157
2021-2022	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.	1157
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The 1157 is a dual-filament bulb rated at 12V with a 21W high filament and a 5W low filament, mounted on a BAY15d bayonet base. The two filaments serve separate lighting functions within a single housing.
The 921 is a single-filament wedge bulb in the T15 form factor, rated at 12V and 16W. The wedge base design requires no separate metal base, as the glass envelope itself is held in place by the socket.
Both the 1157 and 921 conform to ANSI standards applicable in the US and Canada, meaning their electrical and physical specifications follow a defined industry classification rather than a manufacturer-specific designation.
The 1157 and 921 are not interchangeable. The BAY15d bayonet base of the 1157 and the wedge base of the 921 are physically incompatible socket types, and their wattage ratings also differ.
The Kia Forte uses the 1157 for the 2023 model year cornering position and the 921 for the 2021-2022 model years, representing a change in bulb specification between those production periods.