It is just an OBD scan so if you have a DPFix or tune that cancels the codes, you'll be fine. Just can't have any codes and as long as no more than 2 monitors show not ready, you'll pass.
It's getting harder to find emissions stations that are liberal or willing to take a few bucks to pass you. The system is computerized so there's a trail and the fines are pretty big.
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