Audi S8 key fob battery
4 of the 26 model years listed for the Audi S8 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.
- 2001-2006Unknown
Not confirmed yet
- 2007-2010Key-head remote
Not confirmed yet
- 2011-2012Unknown
Not confirmed yet
- 2013-2016Smart key
CR2032
FCC ID IYZFBSB802Two sites agree: bestkeysupply.com and uhs-hardware.com (checked Nov 1, 2026)
Find CR2032 on Amazon - 2017Smart key
Not confirmed yet
- 2018-2026Unknown
Not confirmed yet
Changing the battery
Smart key (push-button start)
- Find the small release on the edge or back of the fob and hold it while you pull out the metal emergency key.
- Look inside the empty key slot for a notch. Put the tip of the metal key or a small flat screwdriver wrapped in tape there and twist gently until the shell splits.
- Pop the old battery out with a toothpick or plastic pick, not a metal blade, and seat the new one with the + side matching the old one.
- Snap the halves back together, slide the metal key home, and press each button, then try the start button from the driver's seat.
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.
Coin cells are a choking and burn hazard for children. Store the spares in their original pack, out of reach.