I have been having a little trouble with my auto box holding onto gears and other annoying little things,after speaking to my local steelers master technition he says that the car will be programmed to run on 18" wheels.
Does anyone know whether there is a programme to change it to 19" inch wheels?

 

bullshit, i run 19" for 2 years now, no issues. What car, petrol or diesel?
Holding gears on diesel could mean DPF trying to regenerate.