I would disconnect battery for say 30 minutes. Whilst waiting reseat the 80 amp fuse in one of the two red positive cables near battery location. When reconnecting battery terminals ensure the positive is fully on and tightened first then firmly add the ground negative cable and tighten. There is no battery reset procedure for your car. The adaptive ECU mapping will be re-learnt but that will happen automatically by normal driving. The clock will obviously need re-setting and any radio stations reset if car radio fitted.

If the MIL light doesn't extinguish after a day or so of driving, an OBD2 Bluetooth dongle paired to a matching app on your phone can read the fault code that triggered it and allow reset with some apps. Otherwise a dealer will. The code would hopefully indicate where the problem is if it persists.