Audi A4 2015 Bulb Size
Bulb size chart
This page helps you find the right bulb sizes for the 2015 Audi A4 by lighting position, so you can replace the correct lamp without guessing. Whether you are changing an exterior signal, an interior courtesy light, or the headlight bulb, the goal is to match the bulb to the exact location on the vehicle.
Because Audi A4 lighting can vary by trim, market, and body style, it is important to verify fitment before ordering. Use the bulb chart on this page to compare each position, including headlights, brake lights, license plate lights, and cabin bulbs, so you can shop with more confidence.
Fitment can differ between halogen and LED-equipped versions, and some cars may have different bulbs depending on factory lighting packages or regional specifications. If you are considering an aftermarket LED conversion, make sure the replacement bulb is compatible with the housing, connector, and any warning-light monitoring system. The safest approach is to check the bulb currently installed in your 2015 Audi A4 before buying, especially for exterior lamps where previous owners may have already made changes.
FAQ
What bulb does the 2015 Audi A4 use for the low beam and high beam headlights?
The listed headlight bulb for both high beam and low beam is D3S. Always confirm your current setup, since lighting equipment can vary by market and package.
What is the reverse light bulb size on a 2015 Audi A4?
The back up reverse light bulb is 921. If your car has been modified, compare the installed bulb to the chart before ordering.
Which bulb fits the front turn signal on a 2015 Audi A4?
The front turn signal bulb is 64132. This is a good example of why checking by position matters, since front and rear signal bulbs are not always the same.
What bulb is used for the rear turn signal?
The rear turn signal bulb is listed as LED on this page. Because the rear lighting assembly can vary, verify the exact lamp style on your vehicle before replacement.
Are the brake lights and tail lights on the 2015 Audi A4 LED?
Yes, the chart lists both the brake light bulb and tail light bulb as LED. That means you should match the correct LED-equipped position rather than assuming a standard replaceable filament bulb.
What bulb does the license plate light use?
The license plate light bulb is listed as LED. This is a common exterior bulb to replace, but the exact housing and connector should still be checked.
What bulb size is used for the map lights and other small interior lights?
The map light bulb, interior door light bulb, glove box light bulb, and trunk or cargo area light are listed as 2825 or 98. These are shared across several interior positions on this page.
What bulb fits the dome light in the 2015 Audi A4?
The dome light bulb is listed as 6411 or 6428. If your dome light has been changed before, confirm the installed bulb number to avoid ordering the wrong one.
What bulb is used in the vanity mirror light?
The vanity mirror light bulb is 6418. This is a separate fitment from the dome and map lights, so it is worth checking each interior location individually.
Do trim level and lighting package affect bulb fitment on the 2015 Audi A4?
Yes. Trim, lighting package, market, and body style can all affect bulb fitment. The same model year may use different bulbs depending on factory equipment.
Can I replace the factory bulbs with aftermarket LEDs?
Yes, but compatibility matters. Aftermarket LED upgrades should match the housing, connector, and any bulb monitoring system, and some installations may require additional parts or coding.
What is the best way to confirm the correct bulb before buying?
Use the bulb chart on this page, then compare it with the bulb currently installed in your 2015 Audi A4. Checking the old bulb is the most reliable way to confirm fitment when the vehicle has been modified or the lighting package is unknown.