One sensor is pre-SCR and one is after so there should be a difference between 'sensor 1' and 'sensor 2'. I can look into this a little more as it's important to me also. I'll see if I can get Carly working. The Torque app might also display data like this.

__________________
8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim