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How do you fix the fault in the SOS system in an Audi A4 B9?

Model: Audi A4 B9 - Years: 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024
Part: Warning light – error code

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If the SOS system has a malfunction, it could be caused by a problem with the emergency battery of the telematics module, a software error, or a malfunction of the onboard network. Initially, try restarting the car by turning it off, closing all doors, and waiting a few minutes.

If the error persists, it is advisable to perform a software update at a workshop. However, it is often necessary to replace the backup battery, which tends to run out after a few years.

The cost is not high, but the intervention of a technician is necessary. If you want to try to solve the problem yourself, check the fuses and connections, but for greater safety it is better to have a check done at an Audi workshop or by a trusted mechanic.


Posted on 24 August 2025 by ScegliAuto


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