QuattroMark
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QuattroMark's post in Air Con issues was marked as the answerSo finally got to the bottom of this!
The new genuine pressure sensor (from Audi) was faulty - simple as!
changed it for another oe sensor, hey presto, got my AC back!
As for the 'missing' air quality sensor....wasn't missing - it doesn't have one.
My car came out of the factory with 'basic' AC climate control which doesn't utilise an air quality sensor........it seems that pre my ownership of the car, someone changed the climate control unit for the 'convenience' version, which does utilise an air quality sensor!