I'm actually having a similar issue. First I'll start off by saying its the Audi A3 2008, it's an 8p chassis and 3.2L vr6 motor.
So earlier this morning my gauge was working just fine, then randomly went down. It is a pretty cold morning so I was assuming that it was just the cold temp, but I took the long and slow way home and still didn't even go up.
After getting home I checked the hoses, they have flow and the hoses are hot. Nothing seems to be out of the ordinary when it comes to the engine running etc. No leaks, I checked the bottom hose where the sensor is(I think that's the sensor anyway) its still in there pretty good. Now when I started checking the gauge to see if it had any movement, I noticed when I turned the key to on the needle goes up such a small amount some wouldn't even notice, like a little spasm. But when the key is turned to off, it goes back down the 1mm if that. Not sure if this is a cluster problem or a fuse problem. Some people were saying check the plug in the engine block and Im lost for words on that cuz not a clue as to where that would be. Any help would be welcomed. Im pretty good with mechanical stuff, not so much electrical which is what I am assuming this issue would be.
I believe the engine code is also CBRA if that helps.
