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It's probably a Federal emissions truck with an OBD1 calibration. Look at the emissions compliance sticker underside of hood and see. If so, it will never clear the P1000.
It's usually exempt due to the combination of model year and GVW of >8500#.
Check with any governing authority you might have to deal with, they should be able to answer any question pertaining to any potential emissions compliance you may have, wherever you are.
For those that are in smog parts. Do you get an exempt sticker or something? Cause there was no official smog guidelines for excursions until 2008.
From what i gather the excursion falls under the Medium-Duty Passenger Vehicles or MDPV category (8,500 and 10,000 lbs GVWR SUV's and are used for personal transportation).
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