For the World tool I have picked up a few pointers. When you set eh car on the bottom directional check the pulse count. It should read 4098 or higher. If it's lower the scan will not take. I can't remember if the fix for that is a new aux sensor board or micro board. One other thing with some versions of Dover software and World tool is you have to save the scan twice after you complete it in order for it to save. for the second save don't move the car off the top directional just go thru the steps on the laptop and save it again. When you go back to check the pulse count they are saved. i hope this helps. Let me know.