Kia K5 Back Up Light Bulb Size

The Kia K5 back up light requires a bulb size of 921 for the specific lighting component located at the rear of the vehicle. Available data covers the range from 2021 to 2024 for the specified automotive application.

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	US Type	EU Type	Shop
2021-2024	921	W16W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921	Check Price

Other Locations

Additional Notes

The 921 bulb is the specified back up light size for the Kia K5 across the 2021-2024 model years.
The 921 is a T15 wedge-base bulb, meaning it uses a tapering plastic base that presses directly into a socket without requiring a separate metal connector or locking mechanism.
The 921 operates at 12 volts and 16 watts, which places it in the mid-output range for incandescent reverse lighting applications.
The 921 designation follows the ANSI standard used in the United States and Canada, making it a widely available bulb type across North American retail and wholesale channels.
The T15 designation refers to the tubular glass envelope of the bulb, with the numeric portion indicating the width in eighths of an inch, placing it at approximately 15/8 of an inch across the glass.
Wedge-base bulbs such as the 921 are not interchangeable with bayonet-base or festoon-style bulbs, as the socket type and retention method differ fundamentally between those designs.