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

YearsBulb Size
202312174NA
202112174SV
201912174NA (With HID Headlamps)
2013-201512496
2009-2012PY21W (With HID Headlamps)
H21W (With Halogen Capsule Headlamps)
200812496 (With HID Headlamps)
H21W (With Halogen Capsule Headlamps)
2000-2006H21W

Rear Turn Signal

YearsBulb Size
2008-2015921
2000-2006P21W

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

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