Audi A3 2018 Bulb Size
Bulb size chart
This 2018 Audi A3 bulb size guide helps you verify the correct bulb type by lighting position, so you can replace the right lamp the first time. Because Audi used different lighting packages and trim combinations, the exact bulb list can vary by body style and market, but this page is organized to make fitment checks simple and fast.
Use this page to match each exterior and interior light on your 2018 Audi A3 with the correct bulb specification before you buy. It covers common locations such as headlights, tail lights, brake lights, turn signals, license plate lights, reverse lights, and cabin bulbs, including LED-equipped versions and the halogen/HID-related items where applicable.
For best results, compare the bulb chart with the equipment already installed on your car, since trim level, package content, and factory lighting options can change the fitment. Some 2018 Audi A3 models use LED lighting in many exterior positions, while others may have different headlight setups such as halogen or HID, so do not assume every A3 uses the same bulb. If you are considering an aftermarket LED conversion, make sure the bulb base, polarity, and housing clearance are compatible, and check whether the vehicle may need coding or error-free bulbs to avoid warning messages. When in doubt, remove the old bulb and verify the markings before ordering replacements.
FAQ
What does this 2018 Audi A3 bulb page help me confirm?
It helps you confirm bulb sizes and bulb types by lighting position, so you can identify the correct fit for each exterior and interior lamp on the 2018 Audi A3.
Are all 2018 Audi A3 models equipped with the same bulbs?
No. Trim level, lighting package, body style, and market can affect the bulb setup. Always compare your specific vehicle to the chart before purchasing.
Which exterior lights on the 2018 Audi A3 are listed as LED?
The chart shows LED fitment for the center high mount stop light, brake light, license plate light, parking light, tail light, daytime running light, rear turn signal, back up reverse light, front turn signal on LED-headlight models, front and rear side marker lights, stepwell light, high and low beam on LED-headlight models, and the cornering light.
What bulb is used for the glove box light on this A3?
The glove box light uses 2825, 98.
What bulb fits the trunk or cargo area light?
The trunk or cargo area light uses 2825, 98.
What bulb fits the dome light and map lights?
The dome light and map lights use 2825, 98.
What bulb is listed for the interior door light?
The interior door light uses 2825, 98.
What bulb is used for the vanity mirror light?
The vanity mirror light uses 6418.
What bulb is listed for front turn signals on HID headlight models?
For 2018 Audi A3 models with HID headlights, the front turn signal light bulb is 64132.
What headlight bulb is listed for HID headlight models?
The headlight bulb for high beam and low beam on HID headlight models is D5S.
Do LED-headlight and HID-headlight A3 models use the same headlight bulbs?
No. The page lists different headlight-related fitments depending on the lighting system: LED-headlight models and HID-headlight models use different bulb specifications.
Should I check the installed bulb before ordering a replacement?
Yes. That is the safest way to confirm fitment, especially if your A3 has a different trim, lighting package, or an earlier replacement part that may not match the original setup.