It really depends upon what year, model, and make you have as to what it is going to take to reset the monitors on your car. While it is true that two complete drive cycles will reset your monitors for the most part, what defines a "drive cycle" is the problem. Some of the early OBDII cars would actually go so far as to clear the monitors everytime you turned the car off! Factory Volvo warranty time is in the area of 2.5-3.0 hours pay to reset monitors. So if they are going to kick down that much you know it can't be a slam dunk. To start with you need to start on a cold engine, but not stone cold, you need to have over 1/2 a tank of gas in it, and the list goes on. I would not reset the codes again and I would just drive it for 2 days to 1 week and then go back. You might want to simply ask the guy doing the test if he could check your monitor status to see of the car is even testable.

Mark