Audi RS3 Turn Signal Bulb Size

The Audi RS3 turn signal requires a bulb size of PY21W for the lighting components. Data for the specific bulb requirements covers the range from 2023 to 2024.

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	US Type	EU Type	Shop
2023-2024	7507	PY21W	Check Price

Bulb Specifications

Description	Type	Shop
ECE standard (Europe & worldwide). Single-filament amber bulb with BAU15s bayonet base. 12V, 21W.	PY21W	Check Price

Other Locations

Additional Notes

The PY21W is the turn signal bulb type specified for the Audi RS3 across the 2023-2024 model years.
The PY21W operates on a 12-volt electrical system and draws 21 watts, placing it in the single-filament category standard for dedicated turn signal applications.
The bulb produces amber light natively, meaning the lens housing does not need to filter a clear bulb to achieve the legally required turn signal color.
The PY21W uses a BAU15s bayonet base, which has offset pins that distinguish it physically from the more common BA15s base. This offset prevents incorrect installation of non-amber bulbs into the socket.
The PY21W is rated under the ECE standard, a regulatory framework recognized across Europe and numerous other markets worldwide.