Audi S4 2015 Bulb Size
Bulb size chart
This page helps you find the right bulb sizes for the 2015 Audi S4 by lighting position, so you can verify the correct fit before you buy. Whether you are replacing an exterior lamp or a cabin light, matching the bulb to the exact location is the safest way to avoid guesswork.
The 2015 Audi S4 uses a mix of LED and conventional bulbs depending on the lamp position. On this page you can check common fitments such as the headlight bulb, reverse light bulb, license plate light bulb, interior bulbs, and other exterior lighting points for this model year.
Fitment can vary by trim, lighting package, market, and body style, so it is smart to compare the bulb listed here with the one already installed in your car. Some 2015 Audi S4 lighting positions use LED modules from the factory, while others use replaceable bulbs such as D3S for the headlight and 921 for the back up reverse light. If you are considering an aftermarket LED conversion, make sure the bulb type, polarity, and physical space are compatible, and be aware that some upgrades may trigger warnings or uneven beam patterns. Before ordering, check the old bulb directly whenever possible, since the installed part is the best confirmation of the correct fit.
FAQ
What bulbs does the 2015 Audi S4 use for the headlights?
The 2015 Audi S4 uses a D3S bulb for both the high beam and low beam headlight function on the listed fitment data.
What is the reverse light bulb size on a 2015 Audi S4?
The back up reverse light bulb is listed as 921 for the 2015 Audi S4.
Are the brake lights on the 2015 Audi S4 replaceable bulbs?
The brake light bulb position is listed as LED, which usually means the light is part of an LED assembly rather than a simple plug-in bulb.
What bulb size is used for the license plate lights?
The license plate light bulb is listed as LED on this page for the 2015 Audi S4.
Does the 2015 Audi S4 use LED daytime running lights?
Yes. The daytime running light bulb is listed as LED for this model year.
What should I use for the front turn signal bulb?
The front turn signal bulb is listed as 64132. Always confirm the installed bulb and the exact lamp style before ordering, since fitment can vary by market.
What bulb do I need for the rear turn signal?
The rear turn signal bulb is listed as LED on the 2015 Audi S4 fitment chart.
Which interior bulbs are listed for the cabin lights?
The map light, glove box light, trunk or cargo area light, and interior door light are listed as 2825 or 98. The dome light is listed as 6411 or 6428, and the vanity mirror light is listed as 6418.
Are the side marker lights LED on this car?
Yes. Both the front side marker light and rear side marker light are listed as LED.
Can trim or package changes affect bulb fitment on the 2015 Audi S4?
Yes. Trim, lighting package, market, and body style can all change the correct bulb type, especially for exterior lighting and LED-equipped lamps.
Should I check the old bulb before buying replacements?
Yes. Checking the installed bulb is one of the best ways to confirm the correct size, especially when the car may have been modified or when multiple bulb options are listed.
Can I switch the 2015 Audi S4 to aftermarket LED bulbs?
You can in some positions, but compatibility matters. Make sure the replacement matches the socket, fits physically, and works with the car’s electrical system without creating warning messages or poor light output.