Hoping someone has come across something similar before, so here goes!
I have a 2.0 TDI A3 (8P chasis) and it had a yellow "oil sensor" warning saying "sensor deffective" come up a while back, I've had the sensor replaced with a genuine VWAG part, and the warning is still on intemittently...
Cheers! I haven't updated this in a while but I eventually just bought two RCA Noise suppressors, fitted them and the intermittent whine is almost inaudible now. I'm going to try and ground the head unit when I get chance and that should hopefully kill the whine permanently!
Just for anyone that finds this down the line, its definitely the climate control fan, managed to pick one up from eBay for £35 and spent about half an hour on it today. Noise has gone!
I've installed a Sony XAV-1500 to my 2011 A3 S-Line with Bose speakers and everything was working great until I started the ignition, the main speakers all work but there's an intermittent high pitch whine from the two (are they tweeters?) small speakers next to the door handles in the rear. Its...
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