Appreciate all the responses. Scooter, emissions are done before you can re-new license plates in northern VA, and if the CEL is on, you fail. If the data link doesn't work, you fail. I just cleared the codes on my daughter's 02ES (the usual 0440 stuff) and took it to an inspector, but since I had just cleared the codes, the emissions computer couldn't see the car's computer and I got a "no test". The inspectors recommendation: drive it 100 miles and then bring it back. As for the 00ES, I'll try again to fix the current setup before I replace the whole thing.