The INFINITI FX45 front and rear side marker bulbs both utilize a 194 bulb size specification. The replacement chart covers 2003 to 2008 model years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The INFINITI FX45 uses the 194 bulb for both front and rear side markers across the 2003-2008 model years.
The 194 is a miniature wedge-type bulb, classified under the T10 form factor, which refers to its tubular shape with a wedge base that requires no separate socket pins.
The 194 bulb operates at 12 volts with a power draw of 3.78 watts, placing it in the low-wattage range typical of marker and courtesy lighting applications.
The 194 carries ANSI standardization, meaning its physical and electrical characteristics conform to a recognized North American specification used across the United States and Canada.
Because the front and rear side marker positions on the INFINITI FX45 share the same bulb size, a single bulb type services all four side marker positions on the vehicle.
The T10 wedge base format is a widely used standard in automotive lighting, and the 194 is one of several interchangeable bulbs within that family, including the 168 and 192, though those alternatives carry different wattage ratings that may affect circuit compatibility.