@AveryBay …also be sure to Google “How to pass an emissions test” or “How to pass a California (or Oregon) emissions test”.
My car tends to come close to not passing, so when my inspection is due, I do everything I can think of beforehand to increase the odds it will pass. This has been working for 20 odd years, but the last few years, just barely. I found those sites to be useful that I found with the Google search. As I recall there’s a couple of websites. They offer practical things you can do to increase your odds, such as putting in a new air filter, making sure the car is fully warmed up, having a full tank of gas, driving the car at freeway speeds for an hour or so to clean out carbon buildup, etc.