Good news with a little perhaps odd news, and a note for future. Unless the drive you took the car on was a very short one the stop/start should work when it's supposed to, there are many conditions where it doesn't operate and that is normal. Lets start with the easy stuff - check the new data you have entered on the scan tool is correct, no fat-finger or other mistakes make sure all electric items that can be turned off are turned off start the engine, briefly turn on the air-con, blower on full, headlights on, hazards on, turn steering wheel to full lock both ways then back to centre - then turn off all those you turned on that aren't required, go for a drive enough to get the engine warmed up. See if that sorts things and report back. Note. - Up to you what you do, but why were these on, all electric items that are not required should be turned off before turning the engine off. No electric items that are not required should be turned on until the engine is running. This not only saves the battery it also mean you can hear the car and engine bay for any strange noises (smells, vibrations) before you drive off and after you have finished your journey without distractions and noise pollution. If you don't already do so, best is to get in the car, turn the ignition on, but don't start the engine, and both whilst putting your seatbelt on check all the warning lights that should both briefly light up and go out as they should, and look, listen (feel, smell) for anything different, this only takes a number of seconds. Start the engine check all dials, gauges and warning lights on dash, and look, listen (feel, smell) for anything different this only takes seconds. Then you can fart about with TwatNav, entertainments and comforts as much as you like before prepare to drive off safely. HTH.