Saab 9000 Back Up Light Bulb Size

The Saab 9000 back up light utilizes a P21W bulb size for the rear illumination system. Data for the specific component covers the production range from 1986 through 1998.

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
1996-1998	P21W
1986-1992	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 back up light bulb type listed across all model years of the Saab 9000 covered by these specifications.
The P21W is an ECE-standard single-filament bulb rated at 12 volts and 21 watts, designed for signalling applications such as reverse lighting.
It uses a BA15s bayonet base, which is a single-contact bayonet fitting with a 15mm collar width.
The BA15s base is distinct from the BA15d double-contact variant; the two are not interchangeable despite sharing the same collar width.
The P21W is governed by ECE regulations, reflecting its origin as a European and internationally adopted standard rather than an SAE-based North American specification.
The Saab 9000 back up light uses this bulb across the 1986-1992 and 1996-1998 model years as recorded in these specifications.
A single-filament construction means the P21W serves one lighting function only, which is consistent with its dedicated use in a reverse light circuit.