Hi Everyone!

For a few weeks now I was investigating my TT because it has engine errors coming mainly from oxygen sensors and chain tensioner solenoid. As I discovered, someone before me changed the ECU for a 8N0906018AQ one, and I believe that's a 1.8t AUQ engine ECU and probably left the wiring as it was. After doing some research I think the right ECU for my car is 8N0906018Q, but I was thinking whether it is possible to upload a 8N0906018Q file to a 8N0906018AQ that I have and it could fix my problems?

Also i have a TT with AJQ engine and I've red that AJQ and APP ECU can be swapped, but do I need to do some modifications or is it a straight-forward swap?

Many thanks to everyone who helps.