Audi S3 Back Up Light Bulb Size

The Audi S3 back up light requires a specific H6W bulb size for proper installation and function within the rear lighting assembly. Data for the specified component covers the period from 2015 through 2020.

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
2015-2020	H6W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAX9s base. 12V, 6W.	H6W

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Additional Notes

The H6W is the back up light bulb used across all documented model years of the Audi S3, spanning 2015-2020.
The H6W operates on a 12-volt electrical system and draws 6 watts, placing it in the low-wattage category typical of signalling and auxiliary lighting applications.
The H6W is a single-filament bulb, meaning it serves one lighting function only and contains no secondary filament for an alternate mode such as dimming or flashing.
The H6W uses a BAX9s base, which is an offset pin bayonet fitting. The asymmetric pin placement on the BAX9s base is designed to prevent incorrect bulb orientation during installation.
The H6W is governed by ECE (Economic Commission for Europe) standards, indicating it meets regulatory requirements for road use in Europe and a number of other markets worldwide.
Because the BAX9s base is a relatively specialized fitting, it is not interchangeable with more common bayonet bases such as the BA9s, despite their physical similarity. Substituting an incompatible base type would result in incorrect fitment.