How to Replace the Battery in an Audi A3 Key?

1 Answers
McDonovan
07/30/25 4:39am
Locate the release button on the car key, press and hold the release button while pulling out the mechanical key. Find the hidden latch inside the mechanical key slot, use the mechanical key to press the latch, pull out the battery holder, remove the battery cover, take out the old battery, install the new battery with the positive side facing up, and the replacement is complete. Reassemble by following the reverse steps. Related information is as follows: 1. Key Functions: The Audi A3 key has three buttons: lock, trunk open, and unlock. Holding down the unlock button can simultaneously lower all four windows, while holding down the lock button can simultaneously raise all four windows. Note that this function requires manual setup; open the multimedia system, find the driving assistance settings to enable this feature. 2. Signs of Low Battery: There are some signs before the car remote key runs out of battery. Observe the brightness change of the remote key indicator light. When pressing the remote button, if the indicator light on the key dims or flickers, it's time to replace the battery. If the remote control distance of the key becomes shorter—previously able to open the door from a distance but now requiring proximity to the door for a response—it's time to replace the battery.
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