obd2 coonection error found with my 2000 vw jetta when tried to comunicate with standard obd2 scanning tool,but no problem with significant obd2 scanning computer .once significant scanning computer connected and erased the #3cyl misfired code the simple obd2 scanning tool connection problem would be free,but after ran up the car on road for while and went to connect and it failed again!
thanx for any help/