i just did a swap from turbo to stock and my check engine light came on. i tried taking out the ecu and battery to reset the car but the light still remains. i even did the paperclip trick to find out the code and it turned out to be a long flash on the cell light which means 10 code ait. then i took it to arco, they did a diagnostic but it nothing came up. does that mean there's nothing wrong with my car? how do i reset or find the problem if there isn't any?

 

Check if all your plugs are hooked up, if you have a disconnected plud sometimes it will set a solid CEL.