For the 2021 Audi TT RS, both the low-beam and high-beam headlights use LED lighting. The supplied fitment data does not identify separate bulb codes or a projector/non-projector distinction, so confirm the original headlamp assembly before ordering replacement parts.
Other exterior lighting is also listed as LED, including the fog lights, front and rear turn signals, reverse lights, brake lights, center stop light, cornering lights, daytime running lights, parking lights, license plate lights, side markers, and tail lights. No replaceable exterior bulb code is provided for these applications.
Interior fitment is mixed. The glove-box light, interior light application, and trunk light are listed as bulb type 2825. The dome, map, and vanity lights are listed as LED. Check the individual lamp location before purchasing, particularly where the vehicle uses integrated LED assemblies.