The INFINITI FX50 side marker utilizes a 12961 bulb size for the exterior lighting system. Data for the specific component covers the range from 2009 through 2013.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The INFINITI FX50 uses the 168 bulb for both front and rear side markers across the 2009-2013 model years.
The 168 bulb is an ANSI-standardized type recognized in the United States and Canada, meaning it conforms to a defined set of electrical and physical parameters shared across manufacturers.
It belongs to the T10 miniature wedge family, a form factor characterized by a wedge-shaped base that seats directly into a socket without a separate metal cap or pins.
The 168 operates at 12 volts and draws 4.9 watts, placing it in the low-wattage range typical of marker and courtesy lighting applications.
Because the front and rear side marker positions on the INFINITI FX50 share the same bulb size, a single bulb type services all four side marker sockets on the vehicle.
The T10 wedge base is one of the most widely used bases in automotive auxiliary lighting, and the 168 is one of several T10-based bulbs that differ from one another primarily in wattage, making wattage verification relevant when substituting one T10 bulb for another.
The 168 and the closely related 194 are both T10 wedge bulbs operating at 12 volts, but the 194 is rated at 3.78 watts rather than 4.9 watts, so the two are not identical despite sharing the same base type and voltage.