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I have a 2009 2ltr TFSI convertible and noticed that the rear window demister doesn't stay on so I checked the roof mechanism and that along with the 4x windows has stopped working. When turning on the ignition it starts "low battery and will charge while driving" but I had a new battery less than 4 years ago?
Any suggestions?
 

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Either the battery hasn't lasted very long (where was the replacement from? Was it fitted properly with the coding updated too?) or there is another fault and it isn't charging properly.

That's where I'd start from.
 
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