The problem with the OBD-II check is that even if the car passes the smog test, it can still fail. If your car is showing any code related to emissions, it will fail, even if the smog test is perfect.
I just had my emissions done on the 14th, and certain years, like mine, only have to have an OBD-II test and gas cap test (to make sure the cap can hold a vacuum). The don't even do the smog test. Next year I'll have to have the smog test done, but I'm not worried about passing.
