2006-2020 Models
The 2006-2020 Audi A3 key fob uses a CR2032 3-volt lithium coin battery. This is a standard battery available at most grocery stores, pharmacies, and online retailers.
Signs your Audi A3 key fob battery is dying include: reduced range (having to get closer to unlock), intermittent button response, delayed unlocking, the low battery warning on your dashboard, or buttons requiring multiple presses to work.
A Audi A3 key fob battery typically lasts 2-4 years depending on usage. Frequent use, extreme temperatures, and proximity to electronic devices can shorten battery life.
Yes, replacing a Audi A3 key fob battery is a simple DIY task that takes under 5 minutes. You only need a new CR2032 battery and optionally a small flathead screwdriver. No dealer visit or programming is required.
No, you do not need to reprogram your Audi A3 key fob after replacing the battery. The fob retains its programming during battery changes. Simply insert the new battery and test the buttons.
CR2032 batteries are available at Walmart, Target, CVS, Walgreens, Amazon, auto parts stores like AutoZone and O'Reilly, and most grocery stores. They typically cost $6-12 for a 2-pack.