If it helps I changed my battery last year with a Varta AGM and all I changed was 1 number using VCDS.
Choose any number in your existing serial number and change it for a different one,save and exit.
I have had no issues since doing this and have all battery monitoring functions working correctly
Very similar to my problem on my 2.0 TFSI engine which turned out to be the electronic thermostat that had gone faulty.
Basically the thermostats on these engines are a electrically controlled valve and what had happened to mine is it had sheared the gear off of the motor which in turn had left...
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