First of all, thank you all for replying and apologies for not being specific about age and make - It is the
Fabia iii 1.0l 94bhp petrol - manual
colour edition.
Age 2019 just under 2 years.
As regards the two fault codes - what I typed is exactly what I typed from Carista. The first one P2B93 did return a VAG result (the Nox heater)
@NTA16 Thank you for spotting that I came from an old car directly to modern electronics without intermediate stages.
I took the car to a well regarded local garage for a proper diagnostic. They had done the first service. As soon as they found the car was still in warranty they wouldn't plug in their machine. Hence my Carista.
Funnily. A few weeks ago Bristol Street motors phoned me to try to buy it back. It is just the inconvenience of replacing it.