This video shows you how to change the car key fob battery on Audi A4's between 2017 and 2019. It works for other cars as well; listed below. If you are having an issue where your car key doesn't unlock the door, it might be the battery. Try first changing the key fob battery in your Audi before doing anything else. Other Audi's have a similar process for checking the battery if it is a different generation than the B9 Audi A4.

Change the car key fob battery on your Audi with this quick video.

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How do I research my repairs? I use a shop service manual like this one here [ Ссылка ]. Search the site if you have another year, they likely have it.
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A4 2019 2018 2017
A4 allroad 2019 2018 2017
A4 Quattro 2019 2018 2017
A5 2018
A5 Quattro 2019 2018 2017
A5 Sportback 2019 2018
Q7 2019 2018 2017
SQ5 2019 2018 2017
TT 2018 2017 2016
TT Quattro 2018 2017 2016

Use better batteries than I did: [ Ссылка ]

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