420d Gran Coupe

To use Kess OBD it requires to be in subscription and constant internet connection

When writing OBD with Kess, ensure you have good internet connection, battery charger is connected, seatbelt plugged in, keys are inside the car, and the hazard lights are on. If kess fails to write first time its fine, just repeat the process again. If push button ignition, hold button for 4 seconds until dash illuminates. Without doing this will still read but fail on write