ECUHELP KT200II User Feedback: DQ250 Error Date 0 !!! I found the problem in the bench box there are 3 wires and one unwelded for no reason neither fell nor hit replacement of the 3 wires.
Therefore, I'll even change the button to a new one like that no more worries about it. 


 

Another one user feedback: It is a very well known problem, sectioning wires and welding are insufficient.
All you have to do is upgrade the Quartz to make the KT200II tool reliable.