for '96 and up vehicles they only check your computer for codes. If the check engine light is off and all of the emission tests were completed you would pass for the majority. They still test your gas cap, but IMO the vehicle's test can detect a bad cap.
As for diesel emissions i believe they started regulations on them in 2007 or 2008 and newer vehicles.
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Ogres are like onions.... they have layers!!!
'86 Camaro
'16 Ram 1500
'14 Charger
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