Volkswagen Scirocco Back Up Light Bulb Size

The Volkswagen Scirocco back up light utilizes a P21W bulb size for illumination purposes. Available information covers a span of time starting in 1975 and ending in 1988.

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
1975-1988	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 Volkswagen Scirocco uses the P21W bulb size for the back up light across all listed model years from 1975 to 1988.
The P21W is an ECE-standardized bulb type, meaning it conforms to regulations used in Europe and other worldwide markets rather than SAE standards common in North America.
The P21W operates at 12 volts with a 21-watt output, which is a typical rating for single-filament signalling applications such as reverse lights.
The P21W uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width. The single-contact design corresponds to its single-filament construction.
Because the P21W is a single-filament bulb, it serves one lighting function only, which is consistent with its use as a dedicated back up light rather than a combined stop or tail light.
The BA15s base is not interchangeable with the BA15d base, which is a dual-contact variant. Substituting a BA15d bulb in a BA15s socket would result in an improper fit.
The uninterrupted use of the P21W across the 1975-1988 Scirocco production span indicates a consistent back up light socket specification throughout the vehicle's entire listed production history.