Ferrari 348 GTS Back Up Light Bulb Size

The Ferrari 348 GTS back up light requires bulb size 1156 or P21W depending on the specific version of the vehicle. Data for the bulb sizes covers the range from 1993 to 1994.

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
1993-1994	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The 1156 is the bulb type specified for the Ferrari 348 GTS backup light across the 1993-1994 model years.
The 1156 follows the ANSI standard, making it a recognized specification within the United States and Canada.
This bulb operates on a 12-volt electrical system and draws 21 watts, which is typical for single-filament automotive applications such as backup lights.
The 1156 uses a BA15s bayonet base, a single-contact mount where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d variant.
Because the 1156 is a single-filament bulb, it serves functions requiring only one lighting state, which aligns with the on/off nature of a backup light.
The BA15s bayonet base requires rotational insertion and locking, a fitment method that differs from wedge-base bulbs and is not interchangeable with them.