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Had a similar high NOX issure, turned out to be the test tube from the engine compartment to the exhaust pipe. Most have been broken off and should be pluged. I found the nut was there but open and let air into exhaust. You can weld the nut closed or install a ball bearing to fill the hole.
To check, go under the car and try to stick a piece of wire through the nut.
I finall found this was open and when fixed the smog test PASSED.
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