>Granted, most cars ought to pass emissions fine until like 200Kk miles.
Depending upon the state, if it's a '96 model or later and the check engine light is not on, it will also likely pass.
Where I live (Missouri) the smog check consists of connecting to the OBD-II interface and seeing if it's reporting trouble codes. The logic here is if all the sensors are reading properly and showing the correct data, then things are performing to spec and there aren't any emissions problems to worry about.
Used to be that if your car was showing OBD errors or was not OBD-II compatible (i.e. pre-96 vehicle) they'd put it on a dyno and see what was coming out of the tailpipe, but now codes are an instant fail and pre-96 are not even required to be tested anymore.
Depending upon the state, if it's a '96 model or later and the check engine light is not on, it will also likely pass.
Where I live (Missouri) the smog check consists of connecting to the OBD-II interface and seeing if it's reporting trouble codes. The logic here is if all the sensors are reading properly and showing the correct data, then things are performing to spec and there aren't any emissions problems to worry about.
Used to be that if your car was showing OBD errors or was not OBD-II compatible (i.e. pre-96 vehicle) they'd put it on a dyno and see what was coming out of the tailpipe, but now codes are an instant fail and pre-96 are not even required to be tested anymore.