As Neil said, change that faulty sensor first before you start panicking 
This will more likely solve the problem, if not we will find the cause one way or another.
I was getting green light in the mornings when firing up the car when I had suspension air leak - car sitting too low message basically.
But then compressor kicks in, tops it up and light goes off.
Fixed it by changing all suspension struts.
I'm sure you know this by now, but don't forget the jacking mode before jacking up the car
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2006 D3 S8 5.2 V10
Ceramic Brakes, Bang&Olufsen, DTV, DAB, Rear Camera, BT, TPMS, Soft Close, Auto Boot, AMI , 4 Zone AC, Home Link, All Electric Blinds, Fingerprint, Ski Hatch, Black Extended Leather, Heated Sport Seats, Alacantra, Carbon Trim inc Aluminium Pack 2.
2015 A3 S line 1.4 TFSI - for the missus to keep her away from my car.
Standard S-line equipment, no extras.
2006 D3 A8 3.7 V8 - SOLD but not forgotten
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