Yes, you can clear code to get yourself into the emission station, but here in Virginia, you won't pass unless you have been through a set run sequence of events that should set the CEL is an emission problem exists that the OBD tool can read. I know on my 06 CTD, there is data on miles, minutes etc since reset and weather the OBD emission cycle has been met. I have the Auterra software that uses the Palm Tungsten E2 from my Banks Ottomind system and an and adapter cord for my OBD/CAN scan tool. The interesting thing is that the Auterra software reads data available in the ECM like the rail pressure that Banks does not display. Only problem is that you can't have both open at the same time. And the Auterra won't read off the Banks interface to the OBD port.