The Lexus IS F back up light requires a 921 bulb size for proper installation and function within the rear lighting assembly. Data for the specified component covers the range from 2008 through 2014.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 921 bulb is the sole bulb size specified for the back up lights of the Lexus IS F across all listed model years.
The 921 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
It is a wedge-type bulb, classified under the T15 designation, which refers to its tubular shape and base style that seats by friction rather than by a bayonet or screw mechanism.
The 921 operates at 12 volts and draws 16 watts, which is consistent with standard automotive electrical systems.
For the general back up light position, the 921 bulb is specified across the full 2008-2014 model year range of the IS F.
For the inner back up light position, the 921 bulb is specified for the 2008-2014 model years, with the exception that the 2009 model year is not listed for that sub-position.
The 2008 inner back up light entry carries a note indicating fitment applies from December 2007, which reflects a mid-production-year introduction of that vehicle.
The consistent use of the 921 across both the general and inner back up light positions indicates that both positions share the same bulb type, though they remain distinct fitment locations.