Audi TT Turn Signal Bulb Size
Audi TT front turn signal bulbs utilize 12174NA, 12174SV, or 12496 bulb sizes, while rear turn signal bulbs use 921 or P21W sizes. The replacement chart covers 2000 to 2023 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Front Turn Signal
| Years | Bulb Size |
|---|---|
| 2023 | 12174NA |
| 2021 | 12174SV |
| 2019 | 12174NA (With HID Headlamps) |
| 2013-2015 | 12496 |
| 2009-2012 | PY21W (With HID Headlamps) |
| H21W (With Halogen Capsule Headlamps) | |
| 2008 | 12496 (With HID Headlamps) |
| H21W (With Halogen Capsule Headlamps) | |
| 2000-2006 | H21W |
Rear Turn Signal
| Years | Bulb Size |
|---|---|
| 2008-2015 | 921 |
| 2000-2006 | P21W |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| OEM part number. Natural amber glass variant. 12V. | 12174NA |
| Philips SilverVision part number. Enhanced coating halogen bulb. 12V. | 12174SV |
| Philips/Osram part number. Halogen bulb, specialty application. 12V. | 12496 |
| ECE standard (Europe & worldwide). Single-filament amber bulb with BAU15s bayonet base. 12V, 21W. | PY21W |
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BAY9s base. 12V, 21W. | H21W |
| ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W. | 921 |
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W. | P21W |