Launch X431 IMMO Plus/IMMO Elite/Immo Pro supports Volvo XC40 2018-2021 add key and all keys lost. Here is the guide to add a spare smart key to XC40.
Select Volvo->XC40->2018-2021->Smart Key
Check Operation guide
IMMO plus will show you operation guide and wiring diagram
To add key, need to remove CEM module
Connect x-prog3 with CEM module follow the wiring diagram
Select Read CEM security data
Save data
Select Smart Key Add function
Turn the START knob to the right one time and then release it.
Load CEM data just read
Place a smart key to be programmed in the cup holder, take other keys out of vehicle
Add key successfully
