The INFINITI QX4 front turn signal uses a 7440, 1156NA, or 1156 bulb size, while the rear turn signal requires a 1156NA or 1156 bulb size. The replacement chart covers vehicle production years spanning 1997 to 2003 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.