I have a 1991 Honda Civic HB that recently failed the NO levels on the smog test. What could the reason be?

I had the oil changed recently, but the car has not been driven much for two years. Although it ped the HC and CO levels they were higher than ave. I have had the O2 sensor replaced within the last 3 years. Since the car has been sitting for a while, could it be that I just need to drive it a long distance to burn off the build-up of residue in the engine? Will this lower the levels of NO and allow my car to p?