Audi A5 2018 Bulb Size
Bulb size chart
This 2018 Audi A5 bulb size page helps you verify the correct bulbs by lighting position before you buy replacements. Whether you are looking for exterior bulbs, interior bulbs, or headlight and fog light fitment, the goal is to make it easier to match the right bulb to the right socket on your A5.
The 2018 Audi A5 uses a mix of LED and halogen-style bulb listings depending on the lamp location and equipment level. Because trim and lighting package can vary by market and body style, checking the position-specific bulb chart is the best way to confirm what your car uses.
For the best fitment results, compare your A5’s installed bulbs with the chart before ordering, especially if your car has a different trim, package, or regional lighting setup. Some positions on the 2018 Audi A5 are listed as LED, while others use specific bulb types such as D5S, H8 LED, 2821, or 12181NA, so do not assume every lamp on the car uses the same design. If you are converting from halogen to LED or replacing an aftermarket upgrade, make sure the bulb is compatible with the housing, connector, and any warning-canceling electronics your vehicle may need.
FAQ
What bulbs does the 2018 Audi A5 use for the low beam headlights?
The 2018 Audi A5 low beam headlight bulb is listed as D5S. Always confirm the installed setup on your car, since lighting packages can vary by market and trim.
What is the high beam bulb for a 2018 Audi A5?
The high beam headlight bulb is listed as D5S on this page. Checking the existing bulb and housing before purchase is still recommended.
What bulb fits the front fog lights on a 2018 Audi A5?
The front fog light bulb is listed as H8 LED. If your car has been modified or converted, verify the connector and fitment before ordering.
What bulb is used for the cornering light on the 2018 Audi A5?
The cornering light bulb is listed as H8 LED. This is one of the positions that can be affected by trim or lighting package differences.
What bulb does the front turn signal use on the 2018 Audi A5?
The front turn signal light bulb is listed as 12181NA. If your A5 has an alternate lighting package, check the installed bulb to confirm.
Are the brake lights and tail lights on the 2018 Audi A5 LED?
Yes, the brake light bulb and tail light bulb are both listed as LED on this page. That includes the rear lighting positions shown in the chart.
What is the reverse light bulb for a 2018 Audi A5?
The back up reverse light bulb is listed as LED. It is a good idea to verify the exact lamp assembly before replacing it.
What bulb does the license plate light use on the 2018 Audi A5?
The license plate light bulb is listed as LED. This is usually a straightforward replacement, but fitment should still be checked against the installed bulb.
What interior bulbs are listed for the 2018 Audi A5?
Interior positions listed on this page include the vanity mirror light, trunk or cargo area light, dome light, map light, interior door light, and glove box light. The glove box light bulb is listed as 2821.
Does the 2018 Audi A5 have different bulb fitment by trim or body style?
Yes. Trim, lighting package, and body style can change bulb fitment, so the same model year may not use identical bulbs in every market or configuration.
Can I replace LED bulbs on the 2018 Audi A5 with aftermarket LED upgrades?
Yes, but you should confirm compatibility carefully. Aftermarket LED replacements can differ in brightness, polarity, error reporting, and physical fit, especially on Audi lighting systems.
Should I check the installed bulb before buying replacements?
Yes. Checking the installed bulb is the safest way to confirm fitment, especially for positions that may vary by package or region. The chart is a guide, but the actual bulb in the car is the final reference.