Yes, you need replace all the modded files with original files when you want to play online. This doesnt count virtual mods, only physic mods.
ahh okey, I thought I could play online even tho I had these mods.... just thought they wouldn´t work, but they are stopping me from being able to connect apparently :|
EDIT: Can I clean my F1 2012 folder without Un-Installing the game and loosing my save? ... I am trying to put my backup files to F1 2012 folder but still I´m not able to connect Online.