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You will need a wifi/enet cable. There is no native in iDrive/Cluster way of doing it.
If you are trying to stick to a budged, get yourself a ENET cable and a free copy of ISTA. ISTA will give you the reading. Do a quick search, you should be able to find instructions on how to use ISTA and see that value.
Alternatively you can use android apps (+wifi dongle/enet) to see the temp via something like Bimmerlink/Torque. or you can use like a dedicated scanner like a NT530. Personally the 530 is a waist of money, get yourself a ENET/wifi dongle and you will get more use out of it.
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