[s-cars] Failed Emissions - NOX Too High - Help ple

[R. Mair]

EGR Valves and their components are the typical cause of high NOX levels.
Also, the hotter the exhaust gas is, the more NOX you'll have. What is your
EGT and/or coolant temp at idle and at elevated RPM's? If you are much above
210f then you run the risk of high NOX. Does your car have an EGR valve?
Check all vacuum hoses associated with the system. If you need more help,
email me directly.

Rolf Mair