There are many things that can cause the NO to be to high, high oil use is a common problem that causes the high reading, but it could be vacuum leak, O2 sensor, a bad spray pattern from the fuel injectors the best thing to do is have an on-board computer diagnostic run on the car. it is doubtful that the EGR would cause this problem unless it is sticking part way open but that should cause a ruff idle maybe even a stall at idle. start with the basics a good tune up and make sure the ignition timing is correct, also try cleaning the injectors and changing the oil, i don't know how bad you failed but if the car was on the border a good tune up might get it to pass.
Can also fail if catalytic converter is bad or if it is burning too much oil. These issues start getting expensive and you will have to start thinking about value of the vehicle vs the cost of repair. If it is a 2001 or older or has more than 150,000 miles then it could be these options listed. Otherwise, your first thoughts are likely correct and cheaper!
1996 Ford Explorer 2WD 5.0L
Canister Purge Valve
Catalytic Converter
EGR Position Sensor
EGR Vacuum Solenoid
EGR Valve
EGR Valve Gasket
EGR Valve Pressure Sensor
Exhaust Manifold
Exhaust Manifold Gasket
Fuel Cap
Muffler - Performance
Oxygen Sensor
PCV Valve
Sensor - Ambient Air Temperature
Smog Pump
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Thanks for the input. It is being dianosed at this time. You are right about these issues and the coat of upkeep versus the cost of keeping it running. I keep ho[ing these things get cheaper. My owner's manual seems to bear out what you are saying. thanks for your help. I don't really seem to be losing a lot of oil however.
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