CHICAGO – Beginning July 15, Illinois motorists with 1996-and-newer vehicles slated for state-mandated emissions testing will be faced with a choice if their vehicle's onboard diagnostics (OBD) system signals an emissions-related problem. The owner can opt for an immediate dynamometer test, which may verify the vehicle does not have excessive hydrocarbon or carbon monoxide emissions. There is no dynamometer test for oxides of nitrogen (NOx), since the Chicago area is designated by the ...
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