Fiat Strada Back Up Light Bulb Size

The Fiat Strada back up light utilizes a P21W bulb size for the rear illumination system. Data for the specified lighting component covers the range from 1979 to 1980.

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
1979-1980	P21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W

Other Locations

Additional Notes

The P21W is the specified back up light bulb for the Fiat Strada across the 1979-1980 model years.
The P21W is an ECE-standard single-filament signalling bulb rated at 12 volts and 21 watts, fitted with a BA15s bayonet base.
The BA15s base designation indicates a single-contact bayonet fitting with a 15mm base width, which is distinct from the dual-contact BA15d variant and the two are not interchangeable.
As a single-filament bulb, the P21W serves one lighting function per unit, which is consistent with its application in a dedicated back up light circuit.
The ECE designation reflects compliance with United Nations Economic Commission for Europe regulations, a standard adopted across European and many worldwide markets.