Posted May 9, 2022. Hi, can anyone please tell me how to resynch the key fob after a battery change, for a 2018 A6. I had the replace key battery replace warning, which I've done but the fob won't now un/lock the car. I can start the car by placing it on the key sensor. Any suggestions welcome, thank you. 17 First Name: Gareth Location: Cardiff Audi Model:: A3 1.6 Sportback Audi Year: 2006 Posted December 31, 2017 Hello Chizy, It is quite possible that the battery on the car may be the original - about the average lifespan of the original. If it were mine, I would be charging it overnight then getting it (and the alternator output) tested. 1. It is necessary to take batteries with the number CR2032 for 3 volts. These batteries, if they are from reputable manufacturers, are replaced at 18-24 month intervals. 2. Lift the cover of the key fob. 3. Remove the cover - the battery is installed in it. 4. Change the battery and install a new one in the cover "+" down. 5. Close the .

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