2000 Dodge Intrepid - Engine Code Question

Today I took my wifes 2000 Dodge Intrepid to New Jersey Auto Inspection. It is a 2.8L V-6 automatic and runs great. To make a long story as short as possible here in NJ we have our cars inspected every 2 years. Anyway I waited in the long line to the inspection station until my turn. They bring the car in and do all the tests needed. At the end of the line one of the inspectors comes up to me and asks me if the check engine light was on recently and if anyone turned it off. I told him the truth that it was not on recently but that I replaced the battery in the car recently. He said that was probably the problem and that I needed to drive at least 400 miles and come back to get reinspected for emissions. He then failed the car. Well when I drove out of the Inspection station I opened up the glove box and grabbed my little maintence book and saw that it was in Novemember that I replaced he battery with a new one. This was done over 1700 miles ago so I would of thought that enough mileage was put on the car to reset the computer in the car. I also remembered about a year before we had an instance when the check engine light did come on. At the time I drove over to my local Autozone since they advertise they will put a scanner on your car for anyone who asks for it at there store free of charge if the engine check light is on. At that particular time the code that came up indicated that the gas cap might be off and sure enough the last person pumping gas into the car didn't screw the cap back on. In NJ an attendant pumps the gas into your car unlike other states. So Autozone turned the check engine light off, I tighten down the gas cap and it never came back on again. As I said that was at least a year or so ago. Now I am at a point not knowing what to do here. I went on the net and read something about a readiness code. It said that if the battery is disconnected as in my case of replacing the original battery the code would be erased Quote: the Readiness code will be erased, which may prevent your car from completing an emissions test. (Readiness code is an indication that certain emission control components of your car have been self-tested). If this is correct where do I go from here?
Can I reset this code so that I could go to inspection or should it have reset on its own since 1700 miles have already been driven since replacing the battery? Other then this the car would of passed inspection today.

Fred