Emissions testing is not a joke, it is political, as the EPA, finds the worst counties as far as pollutants, and then bends the state over and those counties get the strictest rules, now we are talking about tailpipe emissions, not safety, but that is what all vehicles go through here in Tx, in counties that only have safety inspections, it is 12.50, for the safety and emissions it is 39.75, in the past they were just looking for gross polluters, the cars you see running around with white or black smoke pouring out their tailpipes, now in the big city, it is much more serious. I don't inspect cars, I just repair them. BillT you originally said you failed for fuel vapor or fuel leakage, the steps taken to correct your situation, indicate you had High NOX, and probably high CO, Nox will not cause the vehicle any problems, High co, may or may not, too much fuel will often make the car run better, more fuel = more performance in a lot of cases, although fuel mileage should go down.
Also, the figures are skewed, smaller engines are allowed to pollute more, as their small displacement, means even though they are dirtier than other cars, they actually produce less noxious output, volume wise.