Audi A4 2010 Bulb Size
Bulb size chart
This 2010 Audi A4 bulb size guide helps you verify the correct bulb by lighting position, so you can replace a failed lamp with the right fit the first time. Because Audi used different lighting setups depending on trim, body style, and market, checking the exact location on the car is the safest way to match the bulb.
Use this page as a quick reference for exterior and interior bulbs on the 2010 Audi A4, including headlights, tail lights, brake lights, reverse lights, license plate lights, and cabin lamps. It is especially useful when you want to compare halogen and HID-equipped models, or when you are shopping for LED replacement bulbs.
Fitment on the 2010 Audi A4 can vary by trim package, lighting option, and whether the car has halogen or HID headlights, so always confirm the installed bulb before buying. Some positions use different bulb types on halogen and HID versions, and aftermarket LED conversions may need the correct base, polarity, or additional hardware to work properly. If a bulb is hard to identify from the chart alone, remove the old bulb and compare it before ordering, especially for exterior lamps that may have been changed by a previous owner.
FAQ
What does this 2010 Audi A4 bulb guide cover?
It covers common bulb locations on the 2010 Audi A4, including headlights, fog lights, daytime running lights, tail lights, brake lights, reverse lights, plate lights, dome lights, map lights, glove box lights, trunk lights, vanity mirror lights, and other interior or exterior positions.
Why do some bulb sizes differ between halogen and HID headlight models?
The 2010 Audi A4 uses different rear lamp bulb types depending on whether the car has halogen headlights or HID headlights. That means the same lighting position may use one bulb on one version and a different bulb on another, so headlight type matters when checking fitment.
What is the low beam and high beam bulb for the 2010 Audi A4?
The headlight bulb for both high beam and low beam on the HID-equipped 2010 Audi A4 is D3S. If your car is not HID-equipped, the bulb setup may differ, so confirm your headlight package before ordering.
What bulb does the front turn signal use?
The front turn signal light bulb listed for the 2010 Audi A4 is 12272NA.
What bulb is used for the rear turn signal?
The rear turn signal light bulb listed for the 2010 Audi A4 is 7506.
Which bulb fits the reverse light?
The back up reverse light bulb listed for the 2010 Audi A4 is 921.
What are the brake and tail light bulb sizes on halogen headlight cars?
For 2010 Audi A4 models with halogen headlights, the brake light bulb and tail light bulb are listed as 7506R.
What are the brake and tail light bulb sizes on HID headlight cars?
For 2010 Audi A4 models with HID headlights, the brake light bulb and tail light bulb are listed as LED. Because the listing does not provide a specific part number, it is best to match the bulb type by position rather than assume a universal replacement.
What bulb is used for the fog lights?
The front fog light bulb listing for the 2010 Audi A4 shows H11 LED and H16 LED. The correct choice can depend on the exact trim or lighting package, so verify the installed bulb before purchase.
What bulbs are used for the license plate and vanity mirror lights?
The license plate light bulb and the vanity mirror light bulb are both listed as 6418 for the 2010 Audi A4.
What bulb sizes are used for the dome, map, trunk, glove box, and interior door lights?
Several interior positions use 2825 or 98, including the glove box light, trunk or cargo area light, map light, interior door light, side marker light front, and stepwell light. The dome light bulb is listed as 6411 or 6428.
Can I switch my 2010 Audi A4 to LED bulbs?
Yes, many positions on the 2010 Audi A4 can be upgraded to LED, but fitment depends on the socket, polarity, and whether the car already uses LED modules in that location. Exterior lighting conversions may also require error-free bulbs or resistors to avoid dash warnings or hyperflash.
Should I check the old bulb before ordering a replacement?
Yes. Even with a year-specific bulb chart, checking the installed bulb is the best way to confirm fitment on a 2010 Audi A4. This is especially important if the car has been modified, has a different market specification, or has had bulbs replaced with aftermarket parts.