Which type of cable is needed I saw a lot of cables with different price tags on ebay.I also wanted to know what are the things we can do once we have it also I was unable to search for a guide is it pretty straight forward once its plugged in?

From where can this cable procured and what makes this cable so expensive?

 

This is better asked in Diagnostics & VCDS

thanks a lot i was actually searching for it in the octavia section