How to replace remote fob battery in Audi A4, A5, Q7 and TT

December 22, 2017 in Audi A4, Audi A5, Audi Q7 by admin

This tutorial explains how to replace the key fob battery in Audi A4 B9 (2017 and 2018), Audi A5 F5 (2018), Audi Q7 2nd Gen. (2017 – 2018), Audi TT 8S (2016 – 2018) with key fob pictured below (smart key).

LED in the remote control key (arrow in image on right side)

– If you press a button briefly, the LED blinks once.
– If you press and hold a button (convenience opening/closing), the LED blinks several times.
– If the LED does not blink, the remote control key battery is dead. The message “Remote control key: replace
key battery” can also appear in the instrument cluster display. Replace the battery.

To replace remote fob battery you’ll need:

– new CR2032 3v battery (one battery)


In order to replace it, follow the steps:

Step 1: Press the release button (A) and remove the mechanical key from the remote control key.

Step 2: Press the release buttons (C) on the battery holder while pulling the battery holder out of the remote control key in the direction of the arrow.

Step 3: Re-install battery, and slide the battery holder carefully into the remote control key. Insert the mechanical key.

Battery orientation is with the (+) side down.

The instructions in this tutorial will work in the following model years:
– Audi A4 B9 2017 and 2018
– Audi A5 F5 2018
– Audi Q7 2nd Gen. 2017 and 2018
– Audi TT 8S 2016, 2017 and 2018