I have just been through the options on our Fabia Mk3 with a Carista. The main objective was a wish to disable the stop/start. There are two options, the only option that I could use was option 1 which allowed me to raise the voltage from the factory set of 7.4V to 12V. This appears to have done the trick but I have no real understanding of why. Option 2 came up as "unsupported" if someone could possibly explain all of this for me I would be very grateful.

 

Geoff.

Now the car thinks that at 12v battery is empty and disables stop/start. That's my guess.