Hyundai Accent Back Up Light Bulb Size

The Hyundai Accent back up light uses bulb size 921 and bulb size P21W for the rear illumination system. Data for the specified components covers the range from 1995 through 2022.

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
2019-2022	921
2003-2005	921
1995-1999	P21W

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W

Other Locations

Additional Notes

The 921 bulb is a T15 wedge-type bulb operating at 12V and 16W, standardized under the ANSI system used in the United States and Canada.
The P21W bulb is a single-filament signalling bulb with a BA15s bayonet base, operating at 12V and 21W, standardized under the ECE system used in Europe and worldwide markets.
The Hyundai Accent uses the 921 bulb for the back up light across the 2003-2005 and 2019-2022 model years.
The 1995-1999 model years use the P21W bulb instead, reflecting a different regional lighting standard for those vehicles.
The 921 and P21W bulbs are not interchangeable. The 921 uses a wedge base while the P21W uses a BA15s bayonet base, making the two physically incompatible with each other.
Although both bulbs operate at 12V, the P21W draws 21W compared to the 921 at 16W, representing a difference in power consumption between the two fitments.