Question:
Cannot find Toyota Aygo 2023 in vxdiag vcx nano Toyota techstream 18.00.008 software. Does it support Aygo 2023?
Here is the clue.
Toyota Aygo is based on a PSA platform. Toyota Proace is a Peugeot 106 and Citroen C1. The Toyota Aygo was reincarnated into the Peugeot 106 and Citroen C1. So in common, all these shared mostly the same ECUs so had a better chance of talking to most systems.
So you will need PSA diagbox to diagnose.
Techstream v18 cannot diagnose this model.
Use diagbox or universal scanners, Launch X431 or Autel etc.