Audi TT 2021 Bulb Size
Bulb size chart
This page covers the 2021 Audi TT and helps you verify bulb sizes by lighting position, so you can match the correct replacement to each exterior and interior lamp. The TT’s lighting setup is heavily LED-based, and the exact fitment can still vary by trim, market, and body style, which makes checking by location more reliable than guessing from the model name alone.
Use the bulb chart for the 2021 Audi TT to confirm items such as the low beam, high beam, fog light, brake light, turn signal, license plate light, tail light, daytime running light, reverse light, and cabin bulbs. For a car with mixed lighting types, identifying the bulb position first is the easiest way to avoid ordering the wrong part.
For the best fitment results, compare your vehicle’s installed bulbs and housings before buying, especially if your TT has a different lighting package or was built for another market. Many exterior lights on this year are LED assemblies rather than replaceable bulbs, while some interior and utility locations use 2825-style incandescent bulbs. If you are considering an aftermarket LED conversion, make sure the bulb is compatible with the socket, polarity, and any vehicle monitoring system. When in doubt, remove the original bulb and verify the markings, because trim differences can change the correct replacement even within the same 2021 Audi TT lineup.
FAQ
What bulb sizes are listed for the 2021 Audi TT on this page?
This page includes LED lighting positions for the headlight high beam and low beam, fog light, brake light, turn signals front and rear, license plate light, parking light, tail light, daytime running light, side markers, cornering light, reverse light, and several interior lamps. It also lists 2825 bulbs for the glove box, trunk or cargo area, and interior door light.
Are the low beam and high beam bulbs on the 2021 Audi TT replaceable bulbs?
The page lists both the headlight low beam and high beam as LED. On many TT configurations, these are part of LED lighting units rather than simple halogen bulbs, so replacement may involve the full assembly or a specific LED module instead of a standard bulb.
Does every 2021 Audi TT use the same bulb sizes?
Not always. Trim level, lighting package, market, and body style can change the exact fitment. That is why the page is organized by lighting position instead of only by model name.
What should I check before replacing a brake light bulb on a 2021 Audi TT?
Confirm whether your brake light is an LED unit and inspect the housing before ordering parts. If the lamp is integrated, you may need a module or assembly rather than a conventional bulb.
What bulb is used for the glove box light in the 2021 Audi TT?
The glove box light is listed as 2825. It is a small incandescent-style bulb used in several interior applications.
What bulb is used for the trunk or cargo area light?
The trunk or cargo area light is also listed as 2825. Always compare the installed bulb and socket shape before purchasing a replacement.
Are the vanity mirror, dome, and map lights the same on this car?
They are listed as LED for the 2021 Audi TT. Even when the function is similar, the exact lamp design can differ by location, so it is best to match the bulb position on the chart.
Can I switch the 2021 Audi TT exterior lights from LED to halogen bulbs?
Usually no. The exterior lighting shown on this page is listed as LED, and many of these positions are designed around LED assemblies. A halogen swap is generally not a direct fit and may not work correctly.
What is the correct bulb for the license plate light?
The license plate light is listed as LED. If your lamp is dim, flickering, or not working, check whether the issue is the LED unit, the connector, or the housing rather than assuming it is a standard bulb.
How do I know if my 2021 Audi TT has the same rear turn signal bulb as another TT?
Check the rear lighting package and compare the installed lamp to the chart. The rear turn signal is listed as LED, but market and trim differences can still affect the exact replacement method.
What is the safest way to confirm a replacement bulb before ordering?
Remove the existing bulb or inspect the lamp assembly, then compare the markings, connector style, and housing shape to the chart. This is especially important for LED exterior lights and for 2825 interior bulbs, where small differences can matter.
Does this page help with both exterior and interior bulb fitment?
Yes. It covers exterior positions like headlights, fog lights, brake lights, turn signals, reverse lights, and license plate lights, as well as interior locations such as the dome light, map light, vanity mirror light, glove box light, trunk light, and interior door light.