Arizona emissions testing

Arizona follows federal law. Whether or not your emissions facility checks is another story.

If you are running a vehicle with OBD II they don't even open the hood. All they do is plug in to the computer and look for any faults.

If you are running non-OBD they do a visual inspection. That's where engine swaps can get caught.

If you put OBD II in an older vehicle, that will bring on closer inspection since they realize that say a 1970 Dart was not an OBD II vehicle. Of course putting an OBD II engine into an older vehicle would be allowed, but it has to have a MIL light which lights when the ignition is turned on, and turns off when the engine is started. MIL lights cannot be lit during testing.

[ame]http://www2.epa.gov/sites/production/files/documents/engswitch_0.pdf[/ame]