Ford Aspire Back Up Light Bulb Size

The Ford Aspire back up light requires 1156 or P21W bulb sizes depending on the specific version of the vehicle. Data for the bulb sizes covers the range from 1994 to 1997.

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	US Type	EU Type	Shop
1994-1997	1156	P21W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W	Check Price

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Additional Notes

The Ford Aspire (1994-1997) uses the 1156 bulb size across all listed model years for the back up light position.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical specifications are consistent across manufacturers in the United States and Canada.
The 1156 operates on a 12-volt electrical system and draws 21 watts, which is typical for incandescent reverse lighting applications.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, as opposed to dual-filament types that handle two functions from a single housing.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and rotated to lock into place rather than threaded in.
The BA15s base designation indicates a single contact point at the base, which corresponds directly to the single-filament design of the 1156.
Because the 1156 is a single-filament type, it is not interchangeable with dual-filament variants such as the 1157, which shares a similar bayonet base style but carries two contact points and two filaments.