The Kia Sephia brake light requires a 1157 bulb size for proper installation and function within the rear lighting assembly. Data for the specific component covers the period from 1994 through 2001.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Kia Sephia brake lights use the 1157 bulb across all model years from 1994-2001, making it the most consistent fitment in these specifications.
The 1157 is a dual-filament bulb operating at 12V with a 21W/5W output and a BAY15d bayonet base, which allows it to serve both brake and tail light functions within a single housing.
The BAY15d bayonet base on the 1157 features offset pins, a design that prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
The center high mount stop light (CHMSL) on the Kia Sephia uses two different bulb types depending on the model year, with the 921 fitted to 1994-1996 models and the 1156 fitted to 1998-2001 models.
The 1997 Kia Sephia CHMSL uses the 921 bulb, placing it in the same fitment group as the 1994-1996 models rather than the later 1156 group.
The 1156 and 921 are not interchangeable despite both being single-filament bulbs. The 1156 uses a BA15s bayonet base at 21W, while the 921 is a T15 wedge-base bulb rated at 16W, meaning the base types and wattages differ.
The 1157 and 1156 share the same 12V, 21W rating for their primary filament, but the 1157 carries an additional 5W filament and uses a BAY15d base rather than the BA15s base of the 1156, making them incompatible as direct substitutes.
All three bulb types in these specifications, the 1157, 1156, and 921, conform to ANSI standards applicable in both the United States and Canada.