Fiat Brava Back Up Light Bulb Size

The Fiat Brava back up light requires a P21W bulb size for proper installation and function within the rear lighting assembly. Data for the specific bulb size covers the range from 1978 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
1978-1980	P21W

Bulb Specifications

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

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Additional Notes

The P21W is the sole bulb type listed for the Fiat Brava backup light across the 1978-1980 model years.
The P21W is an ECE-standard single-filament bulb rated at 12 volts and 21 watts, designed for signalling applications such as backup lights.
The P21W uses a BA15s bayonet base, which is a single-contact bayonet fitting. This base type is not interchangeable with double-contact bayonet variants such as the BA15d, despite sharing the same physical locking mechanism.
As an ECE-regulated bulb, the P21W was developed for European and worldwide markets, reflecting the Fiat Brava's origin as a European-market vehicle.
The 21-watt output of the P21W places it in the higher-wattage range for single-filament signalling bulbs, which is typical for backup and turn signal functions that require greater light output than, for example, side marker or parking light applications.