It's possible that the car had previously failed badly, but it's also possible that the car was selected due to vehicles in it's category or family having a record of failure, and it's also possible that they just pulled your number at random. It will usually say on the sheet the reason for the test only test. The most common is "High Emitter Profile" meaning that your vehicle is part of a group that has been noticed to be higher than average.

What should you do? My first suggestion is to take it in and have them run it. The worst it will do is fail, and then you can take those results to your regular shop for diagnosis. If it passes, then you have no further problems. If you'd like, you can take it to your regular shop first and have them pretest it, but that's up to you. In any case, without running it on the correct equipment first, you'll have no idea where you're starting from, so all you can do is guess as to what, if anything you need to do.

MV