Hi... I recently purchased an a6 and the stop start function isn't working... it hasn't worked from the moment I got it... 2 days after I bought the car a warning light popped up for an under inflated rear tyre... the sales person is trying to tell me the stop start function isnt working becouse of this warning light regarding the under inflated tyre... personally speaking I think its nonsense... he says its all connected... however I know nothing about the car so I need clarification before I take it further...