INFINITI QX4 License Plate Bulb Size

The INFINITI QX4 license plate light utilizes 168 and 194 bulb sizes for illumination. Data for the specified vehicle components covers the period from 1997 through 2003.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2001-2003	194
1999-2000	194 (With HID Headlamps)
1999-2000	168 (With Halogen Capsule Headlamps)
1997-1998	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The INFINITI QX4 uses two bulb sizes for the license plate position across its production run: the 194 and the 168, both of which are ANSI-standardized miniature wedge bulbs of the T10 type rated at 12 volts.
The 194 bulb draws 3.78 watts, while the 168 draws 4.9 watts. Although both share the same T10 wedge base and voltage rating, the difference in wattage means they are not direct electrical equivalents and should not be treated as interchangeable without accounting for that distinction.
The 194 bulb is specified for the 2001-2003 model years without any conditional fitment notes, indicating a single license plate bulb application across those years.
The 168 bulb is specified for the 1997-1998 model years, again without conditional fitment notes.
The 1999 and 2000 model years each carry two separate specifications tied to headlamp type. Vehicles equipped with halogen capsule headlamps use the 168 bulb, while those equipped with HID headlamps use the 194 bulb.
The headlamp-dependent split in the 1999 and 2000 INFINITI QX4 specifications indicates that the license plate bulb fitment is linked to the vehicle's headlamp package, requiring confirmation of which headlamp system is installed before selecting a replacement bulb for those years.