The Toyota 86 back up light requires a 921 bulb size for proper installation and function. Data for the specified component covers the range from 2017 through 2020.
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 across all back up light positions on the Toyota 86 for the 2017-2020 model years.
The 921 is a T15 wedge-base bulb, meaning it uses a tapering plastic base that presses directly into a socket without a separate metal connector or bayonet pins.
The 921 operates at 12 volts and 16 watts, which places it within the standard low-wattage range typical of reverse lighting applications in passenger vehicles.
The 921 conforms to ANSI standards as recognized in both the United States and Canada, indicating a standardized specification for the bulb's electrical and physical properties across North American markets.
The Toyota 86 carries both a general back up light position and a designated Outer Back Up Light position, with the 921 specified for both, confirming interchangeability between the two positions.
The Outer Back Up Light position lists fitment data for 2017 and 2019 specifically, while the general back up light position covers 2017-2020 without interruption, reflecting position-level fitment distinctions within the same vehicle.