Audi A3 key fob battery
3 of the 21 model years listed for the Audi A3 have a proven battery. The most common answer is CR2032. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 2006-2014Unknown
Not confirmed yet
- 2015-2017Key-head remote
CR2032
FCC ID NBGFS12A71Two sites agree: uhs-hardware.com and americankeysupply.com (checked Nov 1, 2026)
Find CR2032 on Amazon - 2018-2024Unknown
Not confirmed yet
- 2025-2026Unknown
Not confirmed yet
Changing the battery
Key with remote in the head
- This type has the buttons built into the key head. The cell is inside that head, between two clipped halves.
- Work a thin flat tool into the seam near the blade and twist; go round slowly if it does not open at once.
- The coin cell is usually under or on the back of a small board. Keep the rubber button pad in place while you swap the cell.
- Snap it closed and press each button. The car still starts with a dead remote battery on most of these keys, because the start chip needs no battery.
A CR2032 is 20 mm across and 3.2 mm thick. CR2032, CR2025 and CR2016 share the same width but not the same thickness, so a swap between them can leave a loose contact or a case that will not close.
If a child might have swallowed a coin cell, treat it as an emergency and get to a hospital right away.