If it's generally about emissions, remember to always go to a highway and drive the car in high revs (idk about automats but some of them at least have selectors or "at most first two/three gears") for a few miles. Burns off a bit of excess that would show up when then inspector revs it.

Dad used to do it always and never got flagged for emissions. Other faults may have been there though.

Although this was on diesel idk how much it'd help on gasoline cars