The system is supposed to deal with a normal range of conditions. The lambda sensors detects the amount of oxygen in the exhaust. Too much oxygen indicates a lean condition and so the vehicle computer richens the fuel to correct for this condition. Vice versa -too little oxygen indicates a rich condition and so corrects the fuel input to correct for this condition. So the fuel system automatically compensates for changes in air density. Unless you are driving in Oz (where temperature are touching 50C at the momment and possibly beyond the designed tolerances), i would have though that the system should ensure that little difference is felt.
But what do us in Scotland know about driving in warm climates!! 
It would be interesting to know what conditions the system is, in fact designed to cope before performance drop-off. I would have thought that driving at altitude would have a greater effect as air density varies more with height than with temperature - I think?? I am probably wrong about all this as I am no engineer.....
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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