STR8__

Hey guys, few days ago i get engine check VSA and the triangle(next icon to VSA symbol) lighting, wasn't able to accelerate anymore. However, I stopped immediately turn off and start engine up again, than only the engine check lighting.
However, i continue my trip with engine check lighting, but this time the car just runs normally, accelerates and brakes as usual.
Anyway, I went to the garage and my mechanic said that strange error code pop ups on the screen: 205E or 250E. The strange for him was that the error doesn't start with any typical symbol or letter like P or S or whatever is ..... he clean all errors from the computer but suddenly today again the same thing happened again. I will visit the shop again but I really would like to know, anyone had that kind of problem before and how did solve it? Or some recommend about the error?
Thanks!