Volkswagen Quantum Back Up Light Bulb Size

The Volkswagen Quantum back up light utilizes a P21W bulb size for illumination during reverse maneuvers. Data for the specified lighting component covers the period from 1982 through 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
1982-1988	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 Quantum uses the P21W bulb for its back up light across all listed model years, 1982-1988.
The P21W is an ECE-standardized bulb type, meaning it conforms to European and internationally recognized automotive lighting regulations.
As a single-filament bulb, the P21W is dedicated to one lighting function, which in this application is the back up light.
The P21W operates at 12 volts and draws 21 watts, placing it in the standard range for automotive signalling and reversing light applications.
The P21W uses a BA15s bayonet base, where "BA15" refers to the 15mm bayonet cap and "s" denotes a single contact at the base.
The BA15s single-contact base is distinct from the BA15d double-contact variant; substituting one for the other is not compatible due to differing base configurations.