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NOx Emissions

Engine

Vehicle Information: Model: Carrera; Year: 1985; Body Type: Convertible; Engine (type, size, modifications): 3.2 liter; Total Mileage: 76,300;

Upon moving to NJ and undergoing a Vehicle Inspection, the car passed without any trouble except for NOx Emissions. Standard is 1378 with my car registering 1911. No visible smoke and everything else was well within range. I have recently undergone a 75k service at the local dealer. They offer no idea on why the reading is so high. Help with suggestions on what may cause this or how to remedy the situation would be helpful. Thanks!

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