Don't forget to drive around for 30 minutes beforehand, getting the driveline as hot as possible! i'd also change the oil. Your oil almost certainly has fuel in it, which means that the small amount of oil that normally burns will richen up your exhaust readings.
BTW, I don't agree with this, but their logic is as follows:
When you go in for a smog test, they are only getting a tiny fraction of a glimpse into what kind of emissions your vehicle normally puts out, but when they access the ECM, they can get a history. The newer vehicles also have several event recorders, that monitor your vehicle from day one, and with this new system, they can check and see if you at one point made illegal modifications, and fine or fail you for them, depending on what the history tells them. In other words, the idea of swapping in smog legal parts just for the test, and then swapping them back out again after the test, will not work much longer, at least with the newer vehicles.
Take care,
~Chris
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