I sympathize with Bfang Unfortunately BMW doesn't think we need temperature information. I have a code reader plugged into the obd2 and an app on my cellphone. I can get coolant temperature but no transmission temperature. You need to look into getting a Bluetooth or WiFi obd2 code reader and download an app to your cellphone. Then add to the set up a code string allowing access to BMW specific PID's. I have gotten this far but still cannot add the transmission temp to the reader. Sorry I cannot be of more help but hopefully an internet search will help.