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How to Replace the Key Battery on the Audi A3

Model: Audi A3 MK 3, 8V - Years: 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
Part: Key

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Video tutorial

If the key for your Audi A3 has suddenly stopped working, it is likely time to replace the button battery inside. Below, we will discover how to carry out this operation independently.

First, obtain a small flat-head screwdriver and use it to remove the rear cover. Once done, you will have access to the exhausted battery; simply remove it with the screwdriver (or a similar object) and replace it with a brand new battery.

Finally, correctly reassemble the rear cover, and you are finished.


Updated on 1 June 2026 by ScegliAuto


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