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
If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.
| Years | US Type | EU Type | Shop |
|---|---|---|---|
| 2023 | 12174NA | 12174NA | Check Price |
| 2021 | 12174SV | 12174SV | Check Price |
| 2019 | 12174NA (With HID Headlamps) | 12174NA | Check Price |
| 2013-2015 | 12496 | 12496 | Check Price |
| 2009-2012 | 7507 (With HID Headlamps) | PY21W | Check Price |
| H21W (With Halogen Capsule Headlamps) | H21W | Check Price | |
| 2008 | 12496 (With HID Headlamps) | 12496 | Check Price |
| H21W (With Halogen Capsule Headlamps) | H21W | Check Price | |
| 2000-2006 | H21W | H21W | Check Price |
Rear Turn Signal
| Years | US Type | EU Type | Shop |
|---|---|---|---|
| 2008-2015 | 921 | W16W | Check Price |
| 2000-2006 | 1156 | P21W | Check Price |
Bulb Specifications
| Description | Type | Shop |
|---|---|---|
| OEM part number. Natural amber glass variant. 12V. | 12174NA | Check Price |
| Philips SilverVision part number. Enhanced coating halogen bulb. 12V. | 12174SV | Check Price |
| Philips/Osram part number. Halogen bulb, specialty application. 12V. | 12496 | Check Price |
| ECE standard (Europe & worldwide). Single-filament amber bulb with BAU15s bayonet base. 12V, 21W. | PY21W | Check Price |
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BAY9s base. 12V, 21W. | H21W | Check Price |
| ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W. | 921 | Check Price |
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W. | P21W | Check Price |
| ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W. | 1156 | Check Price |