Swap RT6

[mxxxx3]

I have a problem, after replacing the small display with RT6, errors appear and the engine light every time the car is started, when I reconnect the small display, the errors disappear. Maybe someone has an idea how to get rid of this error

[GiveMeABreak]

You need to be a little clearer on what it is you have or are attempting to do.

You can't just swap and change screens about - they need to be compatible with the Head Unit for a start and then configured correctly.