Nissan LEAF Back Up Light Bulb Size

Additional Notes

• The 921 is an ANSI-standardized bulb type recognized across the United States and Canada, ensuring consistent availability and cross-brand compatibility within those markets.
• The Nissan LEAF uses the 921 bulb for its back up lights across all listed model years from 2011-2024, with no variation in this specification throughout that span.
• The 921 bulb follows a T15 wedge base design, meaning it is held in place by friction rather than a locking bayonet or screw mechanism, and is removed by pulling directly from its socket.
• The 921 operates at 12 volts and 16 watts, which places it in the mid-range of standard automotive wedge bulbs by wattage.
• The T15 designation refers to the bulb's tubular shape, with the number indicating a width of 15 eighths of an inch across the widest point of the glass envelope.
• Because the 921 is a wedge-type bulb, it is physically interchangeable with other bulbs sharing the W16W or T15 wedge base, though wattage and voltage ratings should match the original specification to avoid electrical or fitment issues.
• LED replacements for the 921 are widely produced in the T15 wedge format, and compatibility with the LEAF's electrical system should be confirmed before substitution, as some vehicles require load resistors to prevent error codes when switching from incandescent to LED.