Nitrous Oxide or NO is created when your Nissan SX 200's engine combustion chamber temperature reaches over 2500F. Nissan has designed several systems, which when working properly, lower nitrous oxide emissions. Follow the link below to learn more about common Nissan 200SX high NO faults, and engine problems which cause high NOx emissions:
www.smogtips.com/failed-high-NO-nitrous-oxide.cfm
